This paper discusses the development of technology for the production of extruded composite propellant formulations. These formulations are based on thermoplastic elastomers and curable polymer gumstocks as the propellant binder, and utilize ammonium perchlorate as the primary oxidizer. Propellant mixing and other processing procedures are addressed. Evaluations of potential binders, processing details, and theoretical performance characteristics are included to define the parameters used as acceptability criteria. The primary candidates for continued development are identified and details of the processing and evaluation are given.