If a US military base is listed as PPR in the IFR Enroute Supplement, what can you do?

When a US military base is designated as PPR (Prior Permission Required) in the IFR Enroute Supplement, it indicates that prior approval or coordination is needed before you can land there. Therefore, the correct course of action is to list the base as an alternate if conditions for that approval are agreed upon. This means that while you can plan to use the base as an alternate airport, you must first communicate with the appropriate military authority to gain authorization based on their established guidelines or requirements. This ensures that you are compliant with military protocols and have the necessary clearance for landing at that facility.

Other options suggest either a complete restriction on using the base as an alternate or an indiscriminate ability to do so without prior authorization, which does not align with the PPR requirement. Additionally, stating that you can only list the base if you have military orders overlooks the process that allows civil aviation operations to coordinate with military facilities under PPR conditions.