Marines open another probe into sunken tank blamed on errors that killed 9 off San Clemente coast By Julie Watson article Left to Right, top row: Pfc. Bryan J. Baltierra, 19, of Corona, Pfc. Evan A. Bath, 19, of Oak Creek, Wis. Christopher Gnem, 22, of California. bottom row: Lance Cpl. Chase D. Sweetwood , 19, from Portland, Ore. Lance Cpl. Guillermo S. Perez, 20, of N (FOX News) Expand SAN DIEGO (AP) - The Marine Corps has launched a probe looking at the readiness of its troops before they participated in an exercise that ended in tragedy with the sinking of a seafaring tank off the Southern California coast that killed eight Marines and one sailor last summer, officials said Tuesday.