My husband, sonar tech, volunteered from the USS Sacramento & left on a helicopter, Navy or Marine unknown, although another sailor left with the Marines.  He told about needing to pull a transparency every day to calculate the altitude presumably needed to avoid friendly anti-aircraft fire.  I know most helos didn't do that.  Does this sound familiar to anyone?  Nothing in his records about this at all, but I found a buddy who said he did leave on a helo.