This circa 2010 photo provided by Brock McNabb shows him and Pete Linnerooth during a dinner in Capitola, Calif. Linnerooth's best buddy, McNabb, recalls when they were Army psychologists in Baghdad how they'd laugh and find parallels to the plight of Ernest Shackleton, whose ship, Endurance, became trapped in the Antarctic during an early 20th century expedition. The crew ended up on an ice floe, scrambling to survive. (AP Photo/Brock McNabb)

Associated Press
This circa 2010 photo provided by Brock McNabb shows him and Pete Linnerooth during a dinner in Capitola, Calif. Linnerooth's best buddy, McNabb, recalls when they were Army psychologists in Baghdad how they'd laugh and find parallels to the plight of Ernest Shackleton, whose ship, Endurance, became trapped in the Antarctic during an early 20th century expedition. The crew ended up on an ice floe, scrambling to survive. (AP Photo/Brock McNabb)
This circa 2010 photo provided by Brock McNabb shows him and Pete Linnerooth during a dinner in Capitola, Calif. Linnerooth's best buddy, McNabb, recalls when they were Army psychologists in Baghdad how they'd laugh and find parallels to the plight of Ernest Shackleton, whose ship, Endurance, became trapped in the Antarctic during an early 20th century expedition. The crew ended up on an ice floe, scrambling to survive. (AP Photo/Brock McNabb)
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