Core · Weapon · Rules

This Weapon may attack on the same round as Disembarking from a Transport, and/or entering or exiting a Zone. If it does any of these it suffers -2 Ac, or -1 Ac if it has a R of CC. It still may not attack in the same Round as Embarking into a Transport. If a Unit with an Assault Weapon Disembarks then moves 0”, it counts as having moved 1” for attacking purposes.

Source: Dropzone Commander Rulebook 3.02 · 3.02 · p. 48 · weapon-special-rules