My FIL retired as an AF Colonel. He served in Vietnam so was eligible to be buried in Arlington, and wanted to be buried there. He and my MIL researched it. She could also be buried there, but only in the same plot as the veteran. And the veteran has to be buried on top of the spouse, even if the veteran dies first. If the veteran dies first, they disinter the veteran, bury the spouse, and then re-inter the veteran on top.
My MIL was having none of that. No way she was going to go through eternity with him on top. So they're both buried across the river in a private cemetery.
What makes it worse is that she died first, and was buried in a casket. No cremation. When he died, he was cremated. We sprinkled half of his ashes on the St. Lawrence river, where they used to have a cottage. The other half he had buried with military honors at the cemetery with my MIL's remains. In the same plot. At her feet. So now they spend eternity with him at her feet. Exactly as she would have wanted it.