The same type of guidance kit was also attached to a 3000 lb Mark 118 bomb, where it was designated GBU-9.

[3][2] Development of the Homing Bomb System (HOBOS) by Rockwell began in 1967 on the request of the U.S. Air Force[3] in response to shortcomings of the AGM-62 Walleye during the Vietnam War.

84 bomb was considered to be more effective than the smaller explosive warhead found on the Walleye, which was designed by the Navy for anti-ship use.

[5] The system was deployed to USAF units at Ubon Royal Thai Air Force Base, Thailand in January 1969[1] and was subsequently used in combat for the first time in February 1969.

The HOBOS system was also used in Operation Linebacker with the 8th TFW once bombing resumed in April 1972.