anti-intrusion system

cryptographic intrusion

buried line intrusion sensor

line intrusion sensor

air intrusion

intrusion

surveillance and intrusion device

electromagnetic intrusion

anti-personnel-anti-material projectile

AV/AT mines (anti-vehicle / anti-tank mines)

anti-aircraft artillery system

anti-tank guided missile system

anti-tank missile system

portable anti-tank missile system

self-propelled anti-tank missile system

anti-ship missile system

Air Defense Anti Tank System (ADATS)

surface-to-air and anti-tank missile system

anti-icing system

thermal anti-icing system

circulation-controlled anti-torque or circulation-controlled direction control system

electrical anti-icing system

hot-air anti-icing system

homing anti-radiation remotely piloted vehicle sensing system

anti-collision system

anti-drone system

anti-APC weapon system

anti-IСВМ system

Advanced Anti-Tank Weapon System-Medium (AAWS-M / [ˈɔːsəm])

fire extinguishing system sprinkler system and fire alarm system

anti-access and area denial (A2/AD)

anti-additive

anti-air operation