The gunman at the Washington Navy yard. Tonight investigators studying these words. They were etched on a gun used by aaron alexis. Abcs senior justice correspondent Pierre Thomas has the first take on what these riddles could mean. Reporter this is a remington 870 pump Action Shotgun like the one used in the Washington Navy yard massacre. A devastating close range weapon that sources tell us that left an horrific scene of carnage in its wake. Abcs has learned that aaron alexis carved the words better off this way and my elf weapon on the stock of the shotgun. Investigators are examining the meaning of the phrases including whether better off this way meant alexis knew he would die in his murderous rampage. As for elf, authorities are not sure what it means though some investigators wonder if it refers to the tech phrase extremely low frequency. Part of the curiosity about that phrase stems from the fact that alexis was a computer technician and was recently ranting to police about hea