The 4th Infantry Division ("Ivy Division") is a modular division of the United States Army based at Fort Carson, Colorado, with four brigade combat teams. It is a very technically advanced combat division in the U.S. Army.
The division has both officially approved and soldiering nicknames; the first, "Ivy," is a play on words of the Roman numeral IV or 4. Ivy leaves also symbolize tenacity and fidelity which is the basis of the division's motto: "Steadfast and Loyal". The second nickname, "Iron Horse", has been recently adopted to indicate the speed and power of the division. As is often the case, soldier monikers also exist as puns on nicknames approved by the military brass, such as Poison Ivy Division as well as The Funky Fourth during the Vietnam era.

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