This is a sole-source contract action for the United States Air Force to procure custom F-35 flight simulator Hand on Throttle and Stick (HOTAS) 80Hz systems from Stirling Dynamics Limited in the United Kingdom. The work involves supplying specific quantities of simulated sticks, throttles, grips, and calibration services. The justification is that Stirling Dynamics is the only vendor capable of meeting the critical 80Hz active force feedback requirement essential for high-fidelity pilot training and testing, and changing products would require replacing 45 existing units at substantial cost. The performance location is Edwards AFB, California. No contract award timeline or budget amount is specified in the description.