Should I say I am a military spouse on my resume?

It is your choice. Many spouses find that one short line explains several moves better than leaving recruiters to guess.

How do I explain time overseas when I could not work?

Label it plainly, for example “Overseas assignment with active-duty spouse; local work restrictions,” and add any volunteer or study from that time.

Yes, when it had real responsibilities. Write it with the same detail as a paid job, and only include results you can explain.

How to write a military spouse resume that explains PCS moves, groups short jobs, counts volunteer leadership and points to spouse hiring programs.