The first flight of Moscow’s new Tupolev PAK-DA stealth bomber has been delayed by about three years. However, according to Russian Deputy Defense Minister Yuri Borisov,” The work on the development of the PAK DA strategic bomber (prospective aviation complex for long-range aviation) continues and it will not be stopped.”. …

The ACES program aims to develop portable, battery‐powered atomic clocks with stability, repeatability, and environmental sensitivity approaching that of laboratory‐grade cesium beam frequency standards. “The history of human knowledge is reflected in our clock technology,” says Robert Lutwak, program manager for the agency’s Atomic Clocks with Enhanced Stability (ACES) project. …

US Air Force could soon begin testing light attack aircraft to see if they’re a viable option for close-air support. The work is being led by Air Force Strategic Development Planning and Experimentation Office. The office will conduct experiments that include live exercises and simulation, and it will help senior Air …