The UH-1 "Huey" helicopter became a symbol of U.S. combat forces in Vietnam.

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The UH-1 "Huey" helicopter became a symbol of U.S. combat forces in Vietnam.

In a Mail Call video, R. Lee Ermey answers a question from Don of Gresham, Oregon who wants to know the difference between a slick, a dust-off, and a gunship. Ermey says that what Don is talking about is one of his favorite helicopters, the Huey. Although they began as medical helicopters, at the height of the war Hueys had three different functions: they were slicks, dust-offs, or gunships. Slick was the name for the transport version of the Huey, dust-off was the official call sign for medical choppers, and gunships are pretty self-explanatory. Modern versions of the Huey are still being used today!

US plane spraying Vietnam landscape with tainted herbicide/defoliant Agent Orange during the war. (Credit: Dick Swanson/The LIFE Images Collection/Getty Images)

The guerilla warfare tactics of the North Vietnamese required U.S. military leaders to modify their combat strategy during the Vietnam War.

How many steps are there to the crown of the Statue of Liberty? Find out that and other facts and figures about America's most recognizable symbol of freedom.

With almost 50,000 manufactured during World War II, the M4 medium tank, popularly known as the "Sherman," provided critical armored support to Allied ground troops.