As President Donald Trump closed his remarks and invited first lady Melania Trump to the dais along U.S. 50 in downtown Washington, the assembled crowd of thousands began an impromptu rendition of "Happy Birthday."The president, who turned 79 Saturday, smiled and paused as the singing gave way to a young Army officer approaching with a folded U.S. flag.The officer presented Trump the flag on behalf of the U.S. Army Golden Knights and said it had flown over the Capitol earlier in the day to commemorate the nations oldest military branch.TRUMP CELEBRATES US' LONG HISTORY OF GIVING FOREIGN ENEMIES HELL AT MASSIVE MILITARY PARADETrump had received blowback, mostly from the left, for holding the Army commemoration with critics pointing out it also fell on his birthday."Im horrified by the parade, because this is not about honoring our military," Sen. Adam Schiff, D-Calif., a frequent Trump critic, said on a recent podcast. "Its a military vanity show for a president whos long wanted to have tanks rolling down the streets of our nations capital."HEADING TO TRUMPS MILITARY PARADE? HERES EVERYTHING YOU NEED TO KNOWRep. Steve Cohen, D-Tenn., also recently drafted the HAPPY BIRTHDAY Budget Act, which would prohibit taxpayer dollars for such celebrations.CLICK HERE TO GET THE FOX NEWS APPDuring the parade, Vice President JD Vance noted that Saturday was his and second lady Usha Vances wedding anniversary. It is also Flag Day, the date in 1777 when the Continental Congress adopted Betsy Ross Stars and Stripes flag.