Which uniform can I wear for special occasions, the old green Class A of my time in service, or the new ASU?

...at the highest grade attained, which sounds like SP5 Cam Garcia should wear the Air Force Uniform unless the highest grade attained was in the Army. Not sure where you will locate ASU Specialist 5 rank.

Thank you MSG Duchesneau, After my discharge from active duty as a Sp5/E5, I went into the Army Reserves and was promoted to E6. When I transferred to the Air Force Reserves, I was awarded the rank of TSgt (SSgt). So from what I've been reading, I guess either the Army or Air Force military Class A uniform in the rank of E6 would be in order.

If you served under GEN Washington by all means, go on!

I would use a bit of common sense and stay with uniforms not older that what a service member worn during his/her time.

SPC Joseph Wojcik- Good one :) In all seriousness though, it is about common sense and respecting the appropriate times, places and reasons for wearing the uniform. I obviously didn't serve during the Spanish American War, but have worn the equivalent naval officer's uniform of the period once. Likewise, that of naval officers of WWI. On occasion, I've even worn the "uniforms" of colonial irregulars serving during the French and Indian War. In each case, wearing these uniforms conformed to an event, followed the regulations of the period, and was done so to promote respect for the men who did serve in those times.

MAJ Javier Rivera - I think that SPC Wojcik was engaging in satire, not really requiring an answer. Lol!