Green lasers often used for sighting/targetting/distance calculations, such as bouncing off the moon to monitor gravity variations etc etc. Green lasers are the most easily seen/brightest lasers because the eye is more sensitive to green than any other colour.
Anyway, point being that using green is likely to be noted by casual observers, so unlikely to be a feature of any covert weapon system
Green lasers often used for sighting/targetting/distance calculations, such as bouncing off the moon to monitor gravity variations etc etc. Green lasers are the most easily seen/brightest lasers because the eye is more sensitive to green than any other colour.
Anyway, point being that using green is likely to be noted by casual observers, so unlikely to be a feature of any covert weapon system
Also, being unmoving in any fashion for ten minutes is so astronomically complex that it would likely be beyond human ability.
Due to orbit and planetary rotation, to have literally zero movement in the beam is basically impossible for that length of time.
which means it is originating on the ground.
Blue is used for under water measurements as it penetrates further, up to 300 feet I've read.