During World War II, the only logistics force in the U.S. Army, composed entirely of African-American women, took on a seemingly impossible task: to clean up three years of letters from undelivered U.S. soldiers in just six months.This is not only a race against time, but also an extreme test of patience, perseverance and belief.Every letter is the deepest concern in the hearts of the frontline soldiers; and they deliver thoughts and hopes one by one with silence and perseverance.