Naval Fighter Series NF121 is an in-depth study of the design and development of the FF-1 and its derivatives. The first half of the book describes the XFF-1, FF-1, XSF-1, SF-1, XSF-2, GG-1 and XSBF-1 in detail with photographs and drawings, while the second half of this book covers operational use. While U.S. Navy service was limited to two fleet squadrons, the FF-1 and SF-1 enjoyed long careers in Navy and Marine Corps Reserve squadrons until mid-1942. This book is a fascinating study of a little-known Navy fighter that set the stage for Grumman?s dominance of carrier-based naval aircraft that lasted over 50 years.