His knowledge and abilities are very much in demand, since this world does not yet have heavier-than-air flight, and its possession could decide the war. However, without military assistance from any United States equivalent, the war is going badly for the anti-Perkunishan allies.
His expertise is extremely valuable, given that this world has not yet developed heavier-than-air flight, and possessing it could be decisive. However, without assistance from a US-like military power, the anti-Perkunishan coalition is facing significant challenges.