What is the plan primarily developed for locations with a permanent Air Force presence?

The plan developed for locations with a permanent Air Force presence is indeed the in-garrison expeditionary site plan. This type of plan specifically addresses the unique needs and capabilities required for operations at a site where Air Force personnel and resources are stationed permanently. It incorporates the operational requirements of an in-garrison scenario while allowing for rapid deployment and adaptation in response to changing mission demands.

In-garrison expeditionary site plans ensure that all personnel are prepared for a range of contingencies and that the infrastructure is capable of supporting various missions, from routine exercises to full-scale operational deployments. This planning method allows for effective resource management and ensures that the Air Force can maintain readiness even in a permanent setting.

The other options refer to different types of plans suited for various operational contexts. Expeditionary sites focus on temporary or ad-hoc locations that might not have a permanent presence. Contingency plans are typically for responding to unexpected situations or crises. Base support plans are more generalized and cater to a broader swath of logistical and operational needs across an entire base, rather than addressing the specificities of a permanent presence tailored for rapid expeditionary capability.