I'm just a coxswain in the Canadian Coast Guard Auxiliary - SAR (Central & Arctic) but I'd still would like to say USCG. Perhaps the most undervalued of your five brances of service but every day they make the US a safer place. Whether search & rescue and the legendary Rescue Swimmers, drug smuggling intervention or homeland security. Each day you are making a difference in someone's life and their isn't a better feeling than that. All due respect to the US Marine Corps. Plus the USCG has a rocking tartan - Hamilton!