Campaign Operations, page 83.
Ground units that are part of a Force with this ability and use
the Stand Still movement option receive a –2 Target Movement
Modifier, in place of the usual +0.
This seems, to my mind, backwards. A -2 TMM means the enemy can hit you easier... where as the Alpha Strike version of the same ability (Combat Manual: Mercenaries, page 91) provides a bonus to TMM meaning an penalty to the enemy hitting you if you stand still. One might wonder why anyone would use this ability as it stands.