General Orders No. 11, Washington, D.C., May 5, 1868:
The 30th day of May, 1868, is designated for the purpose of strewing with flowers or otherwise decorating the graves of comrades who died in defense of their country during the late rebellion, and whose bodies now lie in almost every city, village, and hamlet church-yard in the land. In this observance no form of ceremony is prescribed, but posts and comrades will in their own way arrange such fitting services and testimonials of respect as circumstances may permit.From an opinion piece in the Washington Post by a veteran:
It’s not Veterans Day. It’s not military appreciation day. Don’t thank me for my service. Please don’t thank me for my service. It’s take the time to pay homage to the men and women who died while wearing the cloth of this nation you’re so freely enjoying today, day.Stop and remember this weekend.
-Link to Washington Post
It's not about summer and barbecues.