Why doesn't the United States Military consider adding electric or hybrid vehicles to their fleet of installation vehicles?

In some ways some installations have already started this. Units are getting or have gotten electric golf carts and the like for running between facilities or across smaller test site compounds. Hybrids are used for many of our commanders so that they can travel to off-base homes. The issue here depends on how the base or post is situated and handles its vehicles. If a location has 2000 vehicles, motor-pool would have to be huge to be the only charging station and then what size substation and if renewable energies used, what size wind/solar farm would be necessary to support it. At our local base, units are assigned vehicles and they're held by each, charging stations would have to be built scattered around for that scenario. The the real world issue of electric infrastructure comes around. States and cities are struggling with space for placement and where the power will be supplied from. Military bases are no different in that regard. POTUS has mandated a portion of vehicles go electric, I'm not aware of what that number is yet but I'm sure its coming to a base near us all. Monies will have to be redirected from training, readiness, T&E, lifecycle management or some other pot to pay for the upgrades necessary, that said, it will be monetarily painful for some folks.

Over the years the US has looked at various things, I don't recall that any were going to be all that great for a tactical lane. I will say adding terminal to existing facilities can be rather expensive, where as a newer building may be a cost affordable option. I can say the base where I work at as a civilian has tons of electrical vehicles, and IMHO they over priced, and fail often. Those made in the US are often cheaply made and cost almost as much as a regular vehicle.

Good enquiry. As I read I wonder when electrical powered planes and jets will come into use.