Core · Weapon · Rules

If a Unit is hit by this Weapon, place a Jammed Status Token on its Squad. Weapons with two R values that attack a Jammed Squad may use their 1st value. Jammed Squads, and Units and Weapons within them, cannot be affected by their player’s Command Cards that take effect while the Squad is Jammed.

Source: Dropzone Commander Rulebook 3.02 · 3.02 · p. 50 · weapon-special-rules