Alex nods to the C/O and heads back the way he came from the ruins of D.C, on the way he picks up 4 2gen supermutants and orders them to provoke the guards of Rivet City enough for them to open fire, unexpectidly they do as their told and Alex watchs from a nearby destroyed office building.
The guards at the bridge and the reinforcements called in had Black Moderate Combat Armor and Helmets with Protective Visors as well as 10mm Sub Machine guns. 3 of the 2gen supermutants survive as one had a fatal bullet wound to the crotch head, the 3 others retreat as Alex fires off a couple rounds of his Minigun as a signal for the 3 to fall back. Before they can arrive to question Alex, he's already back on his way to the NCR Base.