Joint Tactical Radio System
（重定向自JTRS）
The Joint Tactical Radio System (JTRS) aimed to replace existing radios in the American military with a single set of software-define radios that could have new frequencies and modes (“waveforms”) added via upload, instead of requiring multiple radio types in ground vehicles, and using circuit board swaps in order to upgrade. JTRS has seen cost overruns and full program restructurings, along with cancellation of some parts of the program.