I think the are burying the wives of the veterans too. Stop that and wow, lots of room. Or dig up based on first buried first to be removed when it gets full. Na, just kidding.
The burying of spouses in Arlington National Cemetery has been done of one on top of the pre-deceased veteran instead of side by side for the last couple of decades and perhaps longer. Thus the current individual graves are “bunk beds” so to speak.
My brother, mom and dad are all buried one on top of the other in Punchbowl Cemetery in Honolulu. They have been doing that for years out there.