Always wondered, did any other air forces request "fresh sheet of paper" new designs to fill the role of drogue tower? The UK came up with the Monitor, Sturgeon (postwar, but was it originally designed for other duties?), and the Miles Martinet, may have been others. However, I think the vast majority of aircraft employed on drogue towing duty would have been obsolete aircraft which could do a reasonable job without too much serious modification. Cannot think of any other country that thought drogue towing aircraft should be specifically designed for this role from the start, but I could be wrong! And when did the first drogue towers appear in any air force? I'm guessing in the mid to late 1930s. Apart from fighter aircraft, much drogue towing was carried out for land-based A/A units, armed ships (including merchant vessels in wartime), and also large military aircraft with manual and powered gun positions, including flying boats.