Noun
MCLOS (uncountable)
(military, weaponry) Initialism of manual command to line of sight, a method of missile guidance requiring that the operator manually steer the missile onto the target.
However, fire-and-forget missiles are more subject to electronic countermeasures than MCLOS and SACLOS missiles. Source: Internet
First-generation manually command guided MCLOS missiles require input from an operator using a joystick or similar device to steer the missile to the target. Source: Internet