Joint Tactical Information Distribution System

The Joint Tactical Information Distribution System (JTIDS) is an L band Distributed Time Division Multiple Access (DTDMA) network radio system used by the United States Department of Defense and their allies to provide secure Integrated Communications, Navigation, and Identification (ICNI) by data communications needs, principally in the air and missile defense community. JTIDS radiates 6.4 μs long pulses (measured at the 90% amplitude points) followed by a 6.6 μs long pause.

Source: Wikipedia — Joint Tactical Information Distribution System (CC BY-SA 4.0)