unaccounted for

unanticipated immediate targets

uncertain environment

uncharged demolition target

unclassified matter

unconventional assisted recovery

unconventional assisted recovery coordination center

unconventional assisted recovery mechanism

unconventional recovery operation

unconventional warfare

unconventional warfare forces

undersea warfare

understowed cargo

underwater demolition

underwater demolition team

underway replenishment

underway replenishment force

underway replenishment group

unexpended weapons or ordnance

unexploded explosive ordnance

unified action

Unified Action Armed Forces

unified combatant command

unified command

Unified Command Plan

uniformed services

unilateral arms control measure

unintentional radiation exploitation

unintentional radiation intelligence

uni-Service command

unit

unit aircraft

unit combat readiness

unit commitment status

unit designation list

United States

United States Armed Forces

United States Civil Authorities

United States Civilian Internee Information Center

United States controlled shipping

United States message text format

United States Military Service-funded foreign training

United States Naval Ship

United States Prisoner of War Information Center

United States Signals Intelligence System

United States Transportation Command

unit identification code

unitized load

unit line number

unit loading

unit movement control center

unit movement data

unit of issue

unit personnel and tonnage table

unit price

unit readiness

unit-related equipment and supplies

unit reserves

unit training assembly

unit type code

Universal Joint Task List

universal polar stereographic grid

Universal Postal Union

Universal Time

universal transverse mercator grid

unknown

unlimited war

unmanned aerial vehicle

unplanned immediate targets

unpremeditated expansion of a war

unscheduled convoy phase

unstuffing

unwanted cargo

unwarned exposed

urgent mining

urgent priority

US commercial assets

US Defense Representative

use of force policy

US forces

US national

US Transportation Command coordinating instructions