Yes, it's both. The bases are like little cities, and in some cases big cities, depending on where you are. In the operations of those bases, energy use is a big cost component and potentially a vulnerability, so those bases have been very focused on energy management both for the cost savings and for protecting critical infrastructure. The same is true for operations. Certainly in overseas operations, fuel costs are extremely high, but they also are and have been a vulnerability as U.S. military forces are operating in dangerous places.
On April 2nd, 2019. See this statement in context.