"Blessed be the Lord, my rock, who trains my hands for war, and my fingers for battle."  Psalm 144:1.  God was no a pacifist. The Old Testament abounds with examples of God using war to bring judgment upon nations.  Genesis 15:16; Numbers 21:3; 31:1–7; 32:20–21; Deuteronomy 7:1–2; Joshua 6:20–21; 8:1–8; 10:29–32; 11:7–20.   

Scripture aside, just think honestly for a second.  Do you really think the United States should disarm?  Because that's really the acid test of what Berrigan was teaching.