(Note: This is NOT an official United States Government website)
The Marine Corps was formed as the "Continental Marines" on November 10th, 1775. Want to find out if somebody really is (or was) a Marine? Ask them what the birthday of the Marines is; they'll know.
"Semper Fidalis" often shortened to "Semper Fi" which is Latin for "Always Faithful."
Start here: http://www.marines.com/default.asp
A battalion is a unit of organization. In the Marine Corps units are defined roughly like so:
E1 - Private
E2 - Private First Class (PFC)
E3 - Lance Corporal
E4 - Corporal
E5 - Sergeant
E6 - Staff Sergeant
E7 - Gunnery Sergeant
E8 - Master Sergeant/First Sergeant
E9 - Sergeant Major/Master Gunnery Sergeant
O1 - Second Lieutenant
O2 - First Lieutenant
O3 - Captain
O4 - Major
O5 - Lieutenant Colonel
O6 - Colonel
O7 - Brigadier General
O8 - Major General
O9 - Lieutenant General
O10 - General
In February of 1945 70,000 U.S. Marines attacked a Japanese force of 22,000 men on this island located 650 miles south of Tokyo. In difficult and bloody fighting the Americans all but wiped out the Japanese force, at the cost of more than 7,000 U.S. servicemen dead and 19,000 wounded. The famous photo of Marines raising the flag on Mount Suribachi was taken four days after the invasion.
Iwo Jima was deemed essential to U.S. interests due to it's airfield and proximity to Japan. It was hoped to become an emergency landing strip for bombers returning from Japan.