Father Joe O'Callahan, S.J. was the unlikeliest war hero. A bespectacled math professor from Holy Cross, he became the U.S. Navy's first Jesuit chaplain in World War II and served in combat operations in the Atlantic and Pacific theaters. Father O'Callahan was on the aircraft carrier Franklin, known as "Big Ben", in the Okinawa campaign in early 1945 when massive explosions and fire from a kamikaze bomb attack nearly destroyed his ship. Hundreds of...