The Navy is the Senior service in the U.S.
I hate to admit it, but you're wrong. The Army is the senior service. Navy is junior to Army but senior to Air Force.
It's not that I mind being corrected, but I do hate it when people don't know what they are talking about. You forced me to waste my time finding the exact dates, thought I knew the correct order.
The United States Army was born 14 June 1775.
The United States Navy was born 13 Oct 1775.
Former Sgt. U. S. Army 3/71 - 12/73 (Regular Army)
There ya go. Wrong country - though Tommy Atkins is no slouch, either.