Today I received a QSL card from U.S. Army NETCOM. This was in commemoration of the 68th Military-Amateur Crossband Test on 13 May 2017. Every year more and more military stations are participating in this test. To talk to them you transmit on the ham frequencies where the military stations have their receivers set and listen on the published military frequencies the military stations are transmitting on.
This year there were 12 military stations signed up and I was able to get 6 of them. In addition to the stations US Army MARS transmits a Department of Defense Message usually from the SecDef. This year was special as the Commander USNORTHCOM approved the message vice the SecDef.