Military helicopter fly over

Across the Tidal Basin waters can be seen a military helicopter flying over the Jefferson Memorial. An interesting aspect of living in the Washington, DC metro area is there are helicopters flying around all day, every day: Navy, Marines, Air Force, Army, Coast Guard, State Troopers, Life Flight/MedEvac, county police, television news and radio stations, U.S. Park Police, etc. ... seems like sometimes everyone in DC has a helicopter!