Well, I must say that I only know of five branches of the U.S. military (Army, Navy, Air Force, Marines, Coast Guard), but the President is commander-in-chief of all of them. If you include the National Guard as a branch of the military, then the President becomes commander-in-chief of them when they are called into federal service.
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The commander.
You can contact the local recruitment branch of the service you are interested in. All major military branches recruit.
Army, Navy, AF, Marines, Coast Guard.
John Kennedy was noted for his PT boat service in WW II.
No. The NOAA Commissioined Corps is a "uniformed service", but it is not a military service.