This paper will provide the reader with an in-depth description of the Army Research, Development and Engineering Command's (RDECOM) Joint SATCOM Engineering Center (JSEC) located at Fort Monmouth, NJ. The JSEC is a one-of-a-kind, state-of-the-art facility that has been in existence for over 30 years and has expanded to become a well respected and versatile engineering and research facility that supports all of the military services, Department of Defense (DoD) agencies, special users, as well as private industry and academia. The JSEC is divided into four functional areas: the Control Systems Laboratory (CSL), the Strategic Systems Laboratory (SSL), the Tactical Systems Laboratory (TSL) and the DoD Teleport Testbed (DTT). This paper will touch on the JSEC and the four functional areas in general and it will highlight the most recent addition to the JSEC, the DoD Teleport Testbed. Each functional area with its own mission, expertise and unique assets support the research, development, performance evaluation, system and equipment certification testing and anomaly resolution of space dependent and space based communications systems and equipment in the EHF, Ka, SHF and UHF frequency bands. The JSEC is also utilized to help mitigate program risk by using satellite simulation and participation in annual joint service communications exercises that serve as a platform to prove out real world requirements in a more controlled atmosphere.