Gimlet (rocket) clip capable of fitting the internal rocket bays of the F4D Skyray interceptor was also developed. Following a flyoff against the T-214 rocket, which indicated the necessity to modify the rocket motor to reduce the Gimlet's visual signature, the Navy directed the development of a modified, 'hybrid' rocket, using the T-214's tail; this became known as "T-Gimlet". The modified rocket was considered to be suitable for the Navy's purposes; both the original Gimlet and the T-Gimlet were ordered for production, a 5 million dollar USD contract being allotted to start production at the Shumaker Naval Ammunition Depot in Arkansas. Despite
Letter board Letter board A letter board may refer to two devices. A letter board or letter sign, also known as marquee, is a customizable form of signage that employs individually movable letters of the alphabet. They are used by, "e.g.", movie theaters to list the current roster of films, churches to display the titles of sermons, and other buildings, people, and institutions whose signs are required to change on a regular basis. Letter board also may refer to aid tool, used by people with disabilities, to communicate with others, by pointing letters on board with written on it letters (whole alphabet),