sean hennessey now on why it took so long. >> i felt we should have helped those men. >> reporter: forge lived a humble life as a salesman in blue collar queens, new york, but during world war ii he was a 29-year-old officer for the office of strategic services, the cia of its day training men for top secret rescue behind enemy lines. >> i feel great that i helped to save them. >> reporter: called operation halliard, a massive airlift of more than 500 applied pilots and crew. >> i was the operations officer, knew the circumstances over there, knew the country. >> reporter: it was the summer of 1944. hundreds of allied airmen, mostly american were shot down in the hills of yugoslavia, surrounded by nazi troops. george's wife who worked for the yugoslavian embassy tipped her husband off about the secret location of the downed men. >> my wife wrote me a letter, see what you can do. >> reporter: and so a bold mission was born. >> we trained them in es meanage as much as we could. >> reporter: to get them out he had to build a makeshift air field from c-47 to make quick daring rescue drops,