View of an American M1A1 Abrams tank as it crosses the desert during the Gulf War, Iraq, 1991. Other tanks are visible in the background. (Photo by Allan Tannenbaum/Getty Images)
View of an American M1A1 Abrams tank as it crosses the desert during the Gulf War, Iraq, 1991. Other tanks are visible in the background. (Photo by Allan Tannenbaum/Getty Images)