"Legend has it that the United States Marine Corps was born on 10 November, 1775, at Tun Tavern, in Philidelphia, Pennsylvania. On that day, the Continental Congress passed a resolution authorizing two battalions of Continental Marines. The resolution was sponsored by John Adams. Since 1921, the Corps has celebrated its birthday as 10 November.
Tun Tavern was a popular meeting place of 18th century Philadelphians. The tavern was frequented by sailors and other seafaring men, so it was a logical place to conduct the business of recruiting."
What follows was related to me by a Master Gunnery Sergeant:
When the Navy officers set up a table in the Tun Tavern and started interviewing prospects, they were a bit relieved to finally find a young man who fit their requirements. They had him sign the book, paid him his dollar, and bought a round of rum to toast the enlistment. They were so happy to finally get the whole process underway, they even had a second round. They then send him off to a table in the corner to wait.
After a few more interviews, they found a second recruit, who soon joined the first.
"This is great," the second recruit said. "They paid me right away, and even bought me a tot of rum!"
"Hunh," sneered the first. "In the Old Corps they bought us two."
[From http://www.usmcboot.com/history.htm]