Which plan is primarily developed for locations without a permanent Air Force presence?

The correct answer is the expeditionary site. This plan is specifically designed for situations where the Air Force does not have a permanent presence at a location. Expeditionary sites are typically established in response to temporary operational needs, such as deployments or contingency operations. They are intended to support missions in areas that may require rapid establishment of operations without the infrastructure that permanent bases often provide.

In contrast, the in-garrison plan focuses on operations at established, permanent bases, where the infrastructure and resources are already available. The equipment site plan relates to the distribution and management of munitions or equipment but does not specifically address locations lacking a permanent presence. The temporary operations plan may also apply to short-term missions but is not exclusively for areas with no permanent installations. Hence, the expeditionary site is the most relevant choice for locations without a permanent Air Force presence.