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)

filter center

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

air defense control center

air defense direction center

air filter

air intake filter

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

Defense Energy Support Center

Defense Supply Center

Air Force Air Defense Command

perimeter defense (all-around defense)

beach defense mine / beach-defense mine

filter-separator

fuel filter

gas-particular filter unit (GPFU)

home-made face filter

individual portable filter

oil filter

RF interference filter

filter stack

military-grade filter

slave oil filter