The Mark 80 family of low drag, general purpose bombs has become the standard for the US armed forces and many other countries. Although they have been steadily improved since their introduction in the 1950s, these bombs have generally undergone minor modifications to fuses and filling, not significant design changes. They have also served as the basis for many other munitions, such as the AGM-62 Walleye, the Paveway series of laser-guided bombs, and the AGM-154 JSOW.