Carlsbad NPS and White Sands NPS recently upgraded to the latest p25 vhf relm portables. Most use a repeated p25 conventional setup and can or do use simplex p25 on what they have. I do know they been playing with aes lately but mainly for admin or LE chit chat on and off. I would imagine others got the same equipment also since it all came in and was a hand in old here's the new to use from now on with latest federal lineup/zones.
FWIW I do know the NPS LE channel, not primary or what everyone falls to/uses for interop or regular park activities is strapped on all the new portables and mobiles as well as the DOI admin channel, DOI Project channel. Those are usually used for other things and LE lately has been used for LE secure off the main parks channels.