I wanted to check how effective was the helmet protection of the swat skin, so i called another cop without swat skin and 1 criminal to do the job. I said him to shoot only in the head 1 bullet at the time 1 time to player, starting with me (i had swat skin). So we stand stilled with this guy shooting in our heads with an m4, 1 bullet to me, and 1 bullet to the other cop, but we both died with the same amount of bullets (i died 1 bullet before the other guy since the criminal shot me first).