Commando

Commando is a Fallout 3, Fallout: New Vegas and Fallout 4 perk.

Effects
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%.

Affected weapons in Fallout 4

 * 10mm Auto pistol
 * Automatic Pipe rifle
 * Pipe submachine gun
 * Pipe Auto Pistol
 * Submachine gun
 * Automatic Assault Rifle
 * Automatic Combat rifle
 * Automatic Combat shotgun

In general, Commando affects any automatic pistol or automatic rifle, but, despite its wording, does not affect automatic heavy weapons. There are also exceptions - for example, a pistol-gripped plasma thrower is automatic, but is affected by Gunslinger, not Commando.