Christmas tree (aviation)

A Christmas tree was a type of alert area constructed by the United States Air Force (USAF) for the Strategic Air Command (SAC) during the Cold War. Oftentimes, bombers or tanker aircraft were stationed next to a readiness crew building (RCB), also known as 'mole hole' facilities. The alert apron, also known as an alert ramp, received the name 'Christmas tree', because in plan-form it resembled a tree of the same name.

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