Abstract: This invention relates to a servocontrol system for a weapon such as a missile which is a shoulder-launched, infrared-homing, guided missile which provides frontline troops with effective air defense against low altitude enemy aircraft. The weapon, described herein for purposes of illustration, consists of a missile and launcher combination which can be readily transported and operated within the normal environments associated with ground forces in a combat area. To meet the size, weight, and performance requirements, the missile achieves passive homing guidance by using a space-stabilized, infrared-seeking-head control system to generate guidance signals for a single-channel, variable-incidence wing control system working in conjunction with a rolling airframe.