My son is graduating marine corp graduation, I am My husband is prior army, what service dress does he wear?

1st Lt (Join to see) I suggest business casual unless the uniforms from past service still fit and the personal appearance is in line with the AR

If he was “prior” service he doesn’t have to wear ANY service uniform. If he chooses to, the ASU or “greens” would be appropriate if worn within standard. Showing up at a military function looking sloppy would only draw the wrong kind of attention on your sons day.