(5/6/04 Boston, MA) POWS Porter Halyburton, left, and Fred Cherry, center, with author Jim Hirsch. . (Staff Photo by Mike Adaskaveg. Saved in Adv. Fea) Halyburton and Cherry pose with James S. Hirsch, author of “Two Souls Indivisible: The Friendship that Saved Two POWs in Vietnam.” (Mike Adaskaveg/MediaNews Group/Boston Herald via Getty Images)