JB that was Galaxy Quest 
Mission to mars is the one with the face on mars that turns out to be a hanger for an alien space ship, remember first manned mission to mars went wrong so they send in these guys on a rescue mission, they find a survivor who shows um the face on mars.
From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"