air defense filter center

band-pass filter / bandpass filter (BPF)

dust filter / dust shield, particle filter

dust shield / dust filter, particle filter

filter housing / filter unit

filter unit / filter housing

particle filter / dust shield, dust filter

finite impulse response filter (FIR-filter)

passband filter; bandpass filter (BPF)

surface-to-air missile operations center / SAM operations center (SAMOC)

filter center

air defense control center

air defense direction center

Joint Information Operations Center /Joint Intelligence Operations Center (JIOC)

French Center Recherche Sur Le Renseignement / French Center for Intelligence Research (Cf2r / CF2R)

center-to-center method

air filter

air intake filter

Defense Energy Support Center

Defense Supply Center

Air Force Air Defense Command

Japan Air Self-Defense Force (JASDF) / Japanese Air Force

perimeter defense (all-around defense)

beach defense mine / beach-defense mine

Air Operations Center (AOC)

Joint Air Operations Center (JAOC)

air support operations center (ASOC)

air control center

Air Technical Intelligence Center

Air Force Weapons System Development Center

List of Operational Contact Points between Vulcanological Agencies, Meteorological Watch Offices and Air Control Center

joint air-photo center

key point air raid warning center