Washington saw its biggest military parade in decades.  
Tanks and vehicles rolled through the streets, marking the Army's 250th anniversary.  
Nearly 7,000 troops joined, coinciding with Trump's 79th birthday.  
He got cheers, a 21-gun salute, and a crowd singing "Happy Birthday."  
Meanwhile, protests erupted nationwide.  
In D.C., a march headed to the White House with "Trump must go" signs.  
L.A. police used smoke or gas to disperse "No King" demonstrators.

Wow that parade was epic with tanks and cheers for Trump’s birthday while protests also made noise across the country