020201-N-RV224-001 USS JOHN C. STENNIS (CVN 74) - AT3 Justin Howbert from Berryton, Kan., conducts preventative maintenance on a power supply source used in the Consolidated Automated Support System (CASS) in the avionics shop onboard USS JOHN C. STENNIS. This system supplies power to conduct diagnostic tests on a myriad of avionics equipment. USS JOHN C. STENNIS is currently on a scheduled six-month deployment in support of Operation Enduring Freedom. Cleared for public release by LT James Bunnell,Photo Officer, USS JOHN C. STENNIS. Official U.S. Navy Photograph by PH1(AW/SW) Kevin H. Tierney.