objective

objective area

objective force level

obligated reservist

oblique air photograph

oblique air photograph strip

obliquity

observation helicopter

observation post

observed fire

observed fire procedure

observer-target line

observer-target range

obstacle

obstacle belt

obstacle clearing

obstacle restricted areas

obstacle zone

obstructor

occupational and environmental health threats

occupation currency

occupied territory

Ocean Cargo Clearance Authority

ocean convoy

ocean manifest

oceanography

ocean station ship

offensive counterair

offensive counterair attack operations

offensive information operations

offensive minefield

officer in tactical command

officer of the deck

official information

off-load preparation party

offset bombing

offset costs

offset distance (nuclear)

offset lasing

offshore assets

offshore bulk fuel system

offshore patrol

offshore petroleum discharge system

off-the-shelf item

oiler

on berth

on-call

on-call resupply

on-call target (nuclear)

on-call targets

on-call wave

one day's supply

one-look circuit

on hand

on-scene commander

on-station time

open improved storage space

open ocean

open route

open-source intelligence

open unimproved wet space

operating forces

operating level of supply

operation

operational architecture

operational area

operational art

operational authority

operational characteristics

operational control

operational control authority

operational decontamination

operational design

operational documentation

operational environment

operational evaluation

operational intelligence

operational level of war

operationally ready

operational necessity

operational procedures

operational reach

operational readiness

operational readiness evaluation

operational requirement

Operational Requirements Document

operational reserve

operational route

operational support airlift

operational testing

operational training

operation and maintenance

operation annexes

operation exposure guide

operation map

operation order

operation plan

operations center

operations research

operations security

operations security indicators

operations security measures

operations security planning guidance

operations security vulnerability

operations to restore order

opportune lift

opportunity target

opposite numbers

optical axis

optical minehunting

optimum height

optimum height of burst

orbital injection

orbit determination

orbit point

order

order and shipping time

order of battle

order time

ordinary transport

ordnance

organic

organizational equipment

organizational maintenance

organization for combat

organization for embarkation

organization for landing

organization of the ground

Organized Crime Drug Enforcement Task Force

origin

original destination

original negative

original positive

originating medical facility

originator

oropesa sweep

orthomorphic projection

oscillating mine

other detainee

other war reserve materiel requirement

other war reserve materiel requirement, balance

other war reserve materiel requirement, protectable

other war reserve stock

otter

outbound traffic

outer fix

outer landing ship areas

outer transport area

outline map

outline plan

outsized cargo

overhaul

overhead clearance

overlap

overlay

overpressure

overprint

overseas

Overseas Environmental Baseline Guidance Document

overseas search and rescue region

oversized cargo

over the beach operations

over-the-horizon amphibious operations

over-the-horizon radar

overt operation

overt peacetime psychological operations programs