close defense battery

close-quarters combat (CQC) / close-quarters battle (CQB)

launching battery (missile battery)

battery coolant unit / battery-coolant unit (BCU)

close-in air defense weapon

close air defense

close defense

close-in air defense

coast defense battery

perimeter defense (all-around defense)

beach defense mine / beach-defense mine

at close quarters

close air support (CAS)

close air support mission

close approach

close column

close combat

close combat attack (CCA)

close combat optic (CCO)

close defensive fire

close engagement

close envelopment

close observation

close operations

close political-military communication

close support

close support aircraft

close supporting fire

close-in defensive fire

close-in stun gun

close-in weapons system

precision night close air support (CAS)

Secretary General’s Close Protection Unit