This pilot film is often characterized as being a spin-off of M*A*S*H, but regrettably there is little to no evidence to support the idea. However it was created to capitalize on M*A*S*H's success, having similar characters and setting (M*A*S*H 8065 instead of 8063).
Jerry Houser, Rod McCary, Jonathan Banks, Frank Whiteman, Kim K. Kahana Jr., and Lawrence Rosenberg are guest stars and would not have continued as part of the regular cast if this series had continued beyond the first episode.
Unlike M*A*S*H, the Fighting Nightingales was set during World War II, not the Korean War.