Commando

Commando is a Fallout 3, Fallout: New Vegas, and Fallout 4 perk. In Fallout 3 and Fallout: New Vegas, the perk increases your chance to hit in V.A.T.S. by 25%. This bonus is multiplicative, not additive. In Fallout 4, rank 1 of the perk increases damage dealt by automatic weapons by 20%.

Ranks

 * Rank 1: Rigorous combat training means automatic weapons do 20% more damage