An armoured combat vehicle is an armed and armoured military vehicle used for fighting troops.

If u mean, AEC as in the well known vehicle manufacturer, it stands for associated equipment company.

AEC was a british vehicle manufacturer which built buses and various commercial vehicles from 1912 until 1979.

Trojan Armoured Vehicle Royal Engineers was created in 2007.

An armoured fighting vehicle is an armed military vehicle which runs on wheels or caterpillar tracks, used by fighting troops.

An armoured personnel carrier is an armoured vehicle used to carry infantry soldiers in combat.