When did they stop making Humvees?

Production. AM General Hummer H1 Assembly Plant, Mishawaka, Indiana – 500,000-square-foot plant (46,000 m2) opened 1984 to build HMMWV (HUMVEE) and began production of the H1 in 1992. Production ceased 2006, but HMMWV production continues.

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What vehicle is replacing the Humvee?

JLTV
The Joint Light Tactical Vehicle, or JLTV, has now taken on the mantle of being the new frontline tactical vehicle favored by the U.S. military.