the fastest military jet in service is the Lockheed Martin SR-71 Blackbird. It holds the record for the fastest speed ever achieved by a manned, air-breathing aircraft. The top speed of the SR-71 Blackbird is classified, but it is widely believed to be around Mach 3.3, which is approximately 2,200 miles per hour (3,540 kilometers per hour).
It's important to note that the information I provided is accurate . There may have been advancements in military aviation since then, and new aircraft could have been developed or entered service with even higher speeds. For the most up-to-date information, it is recommended to consult reliable sources or official military channels.