A liquid fluorine closed flow loop and engine test position has been designed, constructed, and operated for extended periods with very few difficulties. This paper describes the design philosophy of the system and discusses the operation experience gained in rocket engine firings and cold flow operations. Based upon experience with this system, a new attitude toward the handling of fluorine has evolved. Fluorine may now be handled with confidence so long as its peculiar characteristics are considered and respected. In this light, more realistic safety, cleaning, passivation, and testing procedures have been developed and are described herein.