Bridgehead and Combat zone

Bridgehead noun - An area in hostile territory that has been captured and is held awaiting further troops and supplies.

Combat zone and bridgehead are semantically related. In some cases you can use "Combat zone" instead a noun "Bridgehead".

Combat zone noun - A military area where combat forces operate.

Bridgehead and combat zone are semantically related. Sometimes you can replace term "Bridgehead" with "Combat zone", this terms are similar.