Arlington Cem. What could this be? has electric, doors, in side of hill, looks like air vents and air conditioning unit outside. looks like its not that taken care of.

https://www.google.com/maps/@38.8816067,-77.0733555,3a,58.8y,72.64h,77.79t/data=!3m6!1e1!3m4!1sEkkW-4ztxUCqR5h2a5kh9Q!2e0!7i13312!8i6656?hl=en