By Tom Roeder tom.roeder@gazette.com -There's a hidden message in Air Force Academy's newest sculpture that former prisoners of war from the school say is as profound as it is profane. The 1-ton bronze features a depiction of life at the Hanoi Hilton, Vietnam's infamous prisoner of war camp. The prisoner shown in the work is bound at the legs, elbows and wrists, placed in a position of supplication by interrogators. But there's something else. "We captured that spirit of defiance," said retired Gen.