May is Military Appreciation month. May 17th is Armed Forces Day and May 26th is Memorial Day. These are good options to recognize and remember the US military.
As a side note, as a kid I use to go to Charleston Air Force Base and Charleston Naval Base on Armed Forces Day. It was pretty cool to go on the planes and ships _ great personal interaction with the airmen and sailors. Also every few years The USAF Thunderbirds or Blue Angels would be there.