Possible Clues:

• Trainees at Parris Island, S.C.
• "Semper fi" group
• Org. for Devil Dogs
• Whom Glenn served with in the '50s
• 'The Few. The Proud.' org
• Trainees at Parris Island, S.C
• "We don't promise you a rose garden" sloganeer
• Their emblem is the Eagle, Globe, and Anchor
• Dept. of the Navy component