OAPEC(組織)

Object Area

Oblique Air Photograph

Observation Helicopter

Observation Post

OBTT

Occupied Territory

OCOC

Ocean Station Ship

OECD(組織)

Office of Naval Intelligence

Office of Strategic Services

Officer Basic Technical Traning

Offshore Patrol

OGPU(組織)

OH

O.H.P(フリゲート艦)

O.H.Perry(フリゲート艦)

OJT

Oliver Hazard Perry(フリゲート艦)

One Day,s Supply

ONI

On The JOB Training

Open Unimproved Wet Space

Operating Forces

Operation

Operational Annexes

Operational Chain Of Command

Operational Control

Operational Intelligence

Operational Reserve

Operational Reseach

OR

Orbit

Orbital Bomber

Order

Order of Battle

Orenge Forces

Organization for Economic Cooperation and Development

Organization of The Arab Petroleum Exporting Countries

Original Destination

Oscillating Type Mine

OSS(1)

OSS(2)

Ossoviachm

OTH

Other Forces of NATO

OTOmat(対艦ミサイル)

OTO Melara 127mm 54 Caliber Cannon(艦砲)

OTO Melara 76mm 62Caliber Compact/Super Rapid Cannon(艦砲)

OTO Melara 76mm 62Caliber Cannon MMI(艦砲)

Out Range

OUWS

Over Shoulder Bombing

Over The Horizon RADAR