ammunition and toxics open space

open burning and open detonation (OBOD) (= open-pit)

open country / open ground

Space System for Tracking Ships and Aircraft in Distress – Search and Rescue Satellite (COSPAS-SARSAT)

observation and fields of fire, avenues of approach, key and decisive terrain,obstacles, and cover and concealment (OAKOC)

air and space doctrine (section of military doctrine)

Allied Joint Doctrine for Air and Space Operations (AJP-3.3)

missile and space defense forces

missile and space intelligence

National Aeronautics and Space Administration (NASA)

National Aeronautics and Space Administrations (NASA)

International Aeronautics and Space Show

International Air and Space Fair

International Court of Aviation and Space Arbitration

air and space attack

intelligence, information, cyber, electromagnetic warfare and space (I2CEWS)

Antimissile and Space Defense Agency

National Aeronautics and Space Council (NASC)

break-open

open arrest

open attack

open barrel sight

open boat

open column

open emplacement

open fire

open flank

open formation

open hostilities

open order

open out

open position

open range