Can my husband (Navy) and I be buried in the same plot

My wife's grandparents' cremains are buried together, the front of the stone shows his name (service member) and the rear of the stone show her name(dependant)

Yes. My mother has already inquired and she will be laid over my father's casket. But as she stated above contact the office to confirm

You need to contact the cemetery directly, as these questions are not answered by cemetery staff.

Yep