The 29-year-old actor attended the event as a guest of news publication USA Today.
Also in attendance was The View host Raven Symone.
Miles visited a USO Warrior and Family Care Center near the city that day and said he was inspired by the visit.
“Thank you @the_USO for facilitating my tour of the Bethesda Warriors and Family Care Center today. A very humbling and inspiring visit,” he tweeted.