Acronyms

ATAK

Android Team Awareness Kit

A government geospatial situational-awareness app widely used for C2 and coordination. In operations it bears on how forces or systems are directed and controlled in the field.

BIS

Bureau of Industry and Security

The U.S. Commerce Department bureau that administers the EAR. In export control it affects whether an item, service, or technical data can be shared or shipped, and under which agency's authority.

C-UAS

Counter-Unmanned Aircraft Systems

Systems and techniques to detect, track, identify, and defeat hostile drones. Also C-UAS / CUAS. In counter-UAS work it bears on how hostile or unauthorized drones are detected, tracked, identified, or defeated.

CAGE

Commercial and Government Entity code

A unique identifier assigned to suppliers to government agencies. In federal acquisition it shapes how a contract is competed, awarded, or administered, so contractors track it to stay eligible and compliant.

CBRN

Chemical, Biological, Radiological & Nuclear

The category of hazards and the detection/response capabilities addressing them. CBRN detection buys warning time: for an operator, the difference between seconds and no notice of a chemical, biological, radiological, or nuclear hazard is the difference between protective action and casualties.

CBRNE

Chemical, Biological, Radiological, Nuclear & Explosives

CBRN extended to include explosive hazards. In CBRN defense it bears on how chemical, biological, radiological, or nuclear hazards are detected, identified, or protected against.

CCL

Commerce Control List

The list of dual-use items controlled under the EAR, organized by ECCN across ten categories (15 CFR 774). The Commerce Control List tells an exporter whether a dual-use item needs a license; misreading it is a common and costly compliance failure for defense-adjacent hardware.

CFAR

Constant False Alarm Rate

A detection threshold that adapts to local noise/clutter to hold the false-alarm rate constant. In electronic warfare and signals intelligence it describes how the electromagnetic spectrum is sensed, exploited, or denied.

CJ

Commodity Jurisdiction

A DDTC determination of whether an item is ITAR (USML) or EAR (CCL) controlled. In export control it affects whether an item, service, or technical data can be shared or shipped, and under which agency's authority.

CONOPS

Concept of Operations

A description of how a system will be used to achieve an operational goal. In operations it bears on how forces or systems are directed and controlled in the field.

COP

Common Operating Picture

A single, shared display of the tactical situation fused from all sources. In intelligence, surveillance, and reconnaissance it describes how information is collected, processed, or turned into decisions.

DDTC

Directorate of Defense Trade Controls

The U.S. State Department office that administers ITAR, including registration and licensing. In export control it affects whether an item, service, or technical data can be shared or shipped, and under which agency's authority.

DF

Direction Finding

Determining the bearing to an emitter from its received signal. In electronic warfare and signals intelligence it describes how the electromagnetic spectrum is sensed, exploited, or denied.

DoDD

Department of Defense Directive

A DoD-wide policy document; DoDD 3000.09 governs autonomy in weapon systems. In defense policy it frames the rules and authorities that govern how a capability may be built, fielded, or used.

DRFM

Digital Radio Frequency Memory

A technique that digitizes, stores, and replays radar signals to create coherent false targets and deception jamming. DRFM is why modern deception jamming is convincing: by storing and replaying a radar's own pulse it creates false targets a legacy radar cannot easily reject, so operators must assume some returns are fabricated.

DRI

Detection, Recognition, Identification

The Johnson-criteria performance levels for an imaging sensor against a target at range. In intelligence, surveillance, and reconnaissance it describes how information is collected, processed, or turned into decisions.

EA

Electronic Attack

The EW subdivision that uses EM energy to degrade, neutralize, or destroy — jamming, spoofing, DRFM, directed energy. Electronic attack is the offensive lever an operator uses to deny an adversary the spectrum — jamming a control link or a radar — and its effects are reversible, unlike kinetic engagement.

EAR

Export Administration Regulations

U.S. Commerce Department (BIS) rules controlling dual-use and commercial items via the Commerce Control List (15 CFR 730–774). The EAR govern most dual-use exports; for a defense-adjacent company, knowing whether a product falls under EAR or ITAR determines the entire compliance path and which agency licenses it.

EAR99

EAR99

The designation for an item subject to the EAR but not listed on the CCL; often no license required, but end-use/user/destination screening still applies. EAR99 is where most ordinary commercial items land — subject to the regulations but not specifically listed; it usually ships without a license, but destination and end use can still trigger one.

ECCN

Export Control Classification Number

A five-character code identifying where an item sits on the CCL and its reasons for control. An ECCN, with destination and end use, decides whether a dual-use export needs a license; getting the classification wrong is one of the most common export-control violations.

EO/IR

Electro-Optical / Infrared

Imaging sensors spanning visible (EO) and thermal (IR) bands, often on a stabilized gimbal. In intelligence, surveillance, and reconnaissance it describes how information is collected, processed, or turned into decisions.

EOB

Electronic Order of Battle

The catalogued inventory of an adversary's electronic emitters and their locations. In operations it bears on how forces or systems are directed and controlled in the field.

EP

Electronic Protection

The EW subdivision that protects friendly use of the spectrum against enemy EA. Electronic protection is what keeps friendly radios, radars, and GPS working while under attack; without it, an operator's own electronic attack can be turned back on them.

ES

Electronic Support

The EW subdivision that searches, intercepts, identifies, and locates EM emissions for immediate threat recognition. Electronic support is the listening half of EW that builds the picture an operator acts on — detecting, identifying, and locating emitters so both intelligence and immediate response have something to work with.

EW

Electronic Warfare

Military use of the electromagnetic spectrum to sense, protect, and attack — comprising EA, EP, and ES. In electronic warfare and signals intelligence it describes how the electromagnetic spectrum is sensed, exploited, or denied.

FDOA

Frequency Difference of Arrival

A geolocation method using Doppler-induced frequency differences across moving receivers. In electronic warfare and signals intelligence it describes how the electromagnetic spectrum is sensed, exploited, or denied.

FMV

Full-Motion Video

Continuous video from an ISR sensor, as opposed to still imagery. Full-motion video lets an operator track and identify a moving target continuously rather than from stills; it is the primary EO/IR product feeding real-time decisions.

FPV

First-Person View

A drone flown via a live video feed to the operator's goggles; common in one-way attack drones. In counter-UAS work it bears on how hostile or unauthorized drones are detected, tracked, identified, or defeated.

GNSS

Global Navigation Satellite System

Any satellite navigation constellation — GPS, Galileo, GLONASS, BeiDou. GNSS is the shared source of position and precise time that countless systems assume will always be there; when it is denied or spoofed, the failures cascade far beyond navigation.

HPM

High-Power Microwave

A directed-energy technique using intense microwave pulses to disrupt or damage electronics. In electronic warfare and signals intelligence it describes how the electromagnetic spectrum is sensed, exploited, or denied.

IDIQ

Indefinite Delivery, Indefinite Quantity

A contract vehicle providing an indefinite quantity of supplies/services over a fixed period. An IDIQ vehicle lets the government order work as needed over a period through task orders; for a contractor it is a standing relationship that converts a single award into recurring opportunity.

IMU

Inertial Measurement Unit

A sensor package (accelerometers + gyroscopes) providing motion and orientation for navigation. In positioning, navigation, and timing it bears on the services that weapons, communications, and networks quietly depend on.

ISR

Intelligence, Surveillance & Reconnaissance

The coordinated collection and processing of information for situational awareness and targeting. ISR is the coordinated business of collecting and turning information into decisions; for an operator its value is measured in whether the right sensor was tasked in time, not in sensor count.

ITAR

International Traffic in Arms Regulations

U.S. State Department (DDTC) rules controlling defense articles and services on the U.S. Munitions List (22 CFR 120–130). ITAR controls defense articles and technical data on the USML; for any company touching them, an ITAR misstep — including sharing data with a foreign person — is a serious legal exposure.

LPI

Low Probability of Intercept

A signal designed to be difficult for an adversary to detect or intercept. Low-probability-of-intercept design keeps a transmission hard for an adversary to detect or locate; for an operator it protects both the link and the position of whoever is transmitting.

MGRS

Military Grid Reference System

The NATO geocoordinate standard encoding position as a grid zone, 100 km square, and easting/northing. In geospatial and navigation work it describes how position and location information is referenced, measured, or exchanged.

MOSA

Modular Open Systems Approach

A DoD acquisition strategy requiring open, modular architectures and standard interfaces. A modular open-systems approach lets a program swap or upgrade parts through published interfaces instead of being locked to one vendor; for the government it is now a directed acquisition requirement.

MUSIC

MUltiple SIgnal Classification

A high-resolution subspace algorithm for estimating emitter directions of arrival. MUSIC is a high-resolution algorithm that resolves closely spaced emitters beyond what conventional direction-finding can; for an operator it means separating two nearby transmitters that would otherwise merge.

NAICS

North American Industry Classification System

The industry-code system used to classify federal contracting opportunities and businesses. NAICS codes classify a business by industry and, in federal contracting, set the small-business size standard for an opportunity; the code on a solicitation can decide whether a firm can even bid.

NAVWAR

Navigation Warfare

Protecting friendly PNT while denying it to adversaries — countering GPS jamming and spoofing. Navigation warfare is the fight to keep friendly PNT while denying the adversary's; for an operator it frames GPS jamming and spoofing as something to be fought through, not merely endured.

NDAA

National Defense Authorization Act

The annual U.S. law authorizing DoD funding and policy; Section 848 restricts certain foreign-made drones. In defense policy it frames the rules and authorities that govern how a capability may be built, fielded, or used.

OTA

Other Transaction Authority

A flexible, non-FAR acquisition instrument for prototypes and research. Other Transaction Authority lets the government fund prototypes and research outside the FAR, reaching non-traditional performers fast; for a startup it is often the most accessible door into defense work.

PCL

Passive Coherent Location

Radar that detects targets using illuminators of opportunity (e.g. broadcast/cellular signals) rather than its own transmitter. In electronic warfare and signals intelligence it describes how the electromagnetic spectrum is sensed, exploited, or denied.

PNT

Positioning, Navigation & Timing

The provision of position, navigation, and precise time — most commonly via GNSS/GPS. Positioning, navigation, and timing are three services almost every modern system quietly assumes; for an operator, protecting PNT is protecting the timing and geolocation that weapons, comms, and networks run on.

PSC

Product Service Code

A federal code describing the product or service being procured. Product and Service Codes describe exactly what the government is buying in a contract action; for a vendor, tracking the right PSCs is how relevant opportunities and market data are found.

RCS

Radar Cross Section

A measure of how detectable an object is by radar. Radar cross-section measures how visible an object is to radar; small drones have a very low RCS, which is the physical reason radar alone often struggles to detect them.

RFI

Request for Information

A pre-solicitation notice used to gather market information from industry. In federal acquisition it shapes how a contract is competed, awarded, or administered, so contractors track it to stay eligible and compliant.

RFP

Request for Proposal

A solicitation inviting contractors to submit proposals for a defined requirement. In federal acquisition it shapes how a contract is competed, awarded, or administered, so contractors track it to stay eligible and compliant.

ROE

Rules of Engagement

Directives defining when and how force may be applied. In defense policy it frames the rules and authorities that govern how a capability may be built, fielded, or used.

SBIR

Small Business Innovation Research

A U.S. federal program funding small-business R&D with commercialization potential. SBIR funds small-business R&D in phases with commercialization intent; for a startup it is a non-dilutive path to prove a defense technology and win a first government customer.

SDR

Software-Defined Radio

A radio whose signal processing is done in software, allowing wideband, reconfigurable RX/TX. In electronic warfare and signals intelligence it describes how the electromagnetic spectrum is sensed, exploited, or denied.

SIGINT

Signals Intelligence

Intelligence derived from intercepted signals — comprising COMINT and ELINT. Signals intelligence — COMINT and ELINT together — is how a force learns from an adversary's own emissions; for an operator it turns the electromagnetic environment into warning and understanding.

STTR

Small Business Technology Transfer

Like SBIR, but requiring partnership with a research institution. STTR funds small-business R&D that must partner with a nonprofit research institution; for a firm it is a route to defense funding that also brings a university or lab's depth to the effort.

sUAS

Small Unmanned Aircraft System

A UAS under 55 lb (25 kg), typically FAA Group 1–2. Small UAS — under 55 pounds — cover most commercial and hobbyist drones and most of the counter-UAS threat; the regulatory line matters because it sets which rules and countermeasures apply.

TDOA

Time Difference of Arrival

A geolocation method using the difference in signal arrival time at multiple receivers. TDOA fixes an emitter's position from tiny differences in signal arrival time across separated receivers; for an operator it is a passive, precise way to geolocate a transmitter without alerting it.

TRL

Technology Readiness Level

A 1–9 scale rating the maturity of a technology from basic principles (1) to proven in operations (9). Technology Readiness Levels give the government a common 1-9 scale for how mature a technology is; for a vendor, a defensible TRL claim shapes whether a program sees the work as a research bet or a fieldable capability.

UAS

Unmanned Aircraft System

An unmanned aircraft plus its control station and data links; the drone and everything needed to fly it. UAS refers to the whole drone system — aircraft, ground station, and data links — not just the airframe; for a counter-UAS operator, every one of those parts is a potential detection or defeat point.

UAV

Unmanned Aerial Vehicle

The aircraft component of a UAS — the drone itself. UAV names the airframe alone, and current usage largely favors UAS for the whole system; the distinction matters when a requirement or threat report means the aircraft specifically versus the full system.

UEI

Unique Entity Identifier

The 12-character SAM.gov identifier that replaced the DUNS number for federal entities. The Unique Entity Identifier is the government's current entity ID, generated in SAM.gov, that replaced the DUNS number; a firm needs it to register, bid, and be paid on federal work.

USML

United States Munitions List

The list of defense articles and services controlled under ITAR (22 CFR 121.1), organized into 21 categories. The U.S. Munitions List defines, by category, what counts as a defense article under ITAR; if an item is on the USML, State Department export control applies, which drives the entire compliance path.

UTM

Universal Transverse Mercator

A global map projection dividing the earth into 60 zones for metric grid coordinates. In geospatial and navigation work it describes how position and location information is referenced, measured, or exchanged.