I’ll give it a shot. Zippers/velcro are critical for most modern military gear. Elevators are used to increase the storage capacity for warplanes on aircraft carriers. Thermometers (well, any temperature sensing device) are important for many weapons systems, guidance computers, etc. Wind turbines… hmm, the infamous Stuka siren was basically a wind turbine welded to the side of the plane!

(This is mostly facetious)