181001-N-DA693-0023 BREMERTON, Wash. (Oct. 1, 2018) Rear Adm. R. Duke Heinz, commander of Naval Supply Systems Command Weapons Systems Support, views a 3-D printer demonstration directed by Machinery Repairman 1st Class Adam Ferenbach aboard the Nimitz-class aircraft carrier USS John C. Stennis (CVN 74). John C. Stennis is in port maintaining readiness. (U.S. Navy photo by Mass Communication Specialist 3rd Class Jake Greenberg/Released)