Hummer was a brand of trucks and SUVs, first marketed in 1992 when AM General began selling a civilian version of the M998 Humvee. In 1998, General Motors (GM) purchased the brand name and marketed three vehicles: the original Hummer H1, based on the military Humvee, as well as the H2 and H3 models that were based on smaller, civilian-market GM platforms.By 2008, Hummer's viability in the economic downturn was being questioned, and it was placed under review by GM management.