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We got an inside look at how new United States Army field artillery soldiers are trained at the Field Artillery School in Fort Sill, Oklahoma. 

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A United States Army officer shares a modified combat rig that could offer service members a more optimized alternative to the traditional TAPS, or tactical assault panel system. In November, we spoke with 1st Lt.

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We got an inside look at how new United States Marine Corps officers are trained at The Basic School, a seven-month program that challenges newly commissioned second lieutenants physically, academically, and tactically.

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Recruit division commanders, known as RDCs, are the drill sergeants of the United States Navy. Before they train Navy recruits at boot camp, future RDCs must graduate from Continuation School, or C School, at Naval Station Great Lakes near Waukegan, Illinois, about 40 miles north of Chicago.

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Military training instructors are responsible for training new recruits at the United States Air Force's 7 ½-week basic military training. But before they're certified to train new recruits in boot camp, they must graduate from the eight-week military training instructor school.

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Slagel Dining Facility is the largest dining facility in the Department of Defense. It serves 12,000 meals a day.

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A New Zealand Army soldier tries a US military MRE — or Meal, Ready-to-Eat — and compares it to New Zealand MREs. An MRE is designed to sustain soldiers during training or an operation while food-service facilities are inaccessible.

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Every day, a team of cooks and waitstaff serves 13,500 meals at the United States Naval Academy in Annapolis, Maryland. Midshipmen gather for every meal in the historic King Hall, the dining hall in T-shaped Bancroft Hall — the largest single-building dormitory in the world.

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In the US Air Force, there are fewer than 100 active members of the special-operations security force known as DAGRE, or Deployed Aircraft Ground Response Element.

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Chief video correspondent Graham Flanagan got an inside look at what it's like on the first day for new freshmen, known as knobs, at the Citadel in Charleston, South Carolina.