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As Grey Ghost noted, all airforces had their share of brave and resourceful men.
Also, How do you really define "underrated"? Achieved more with less? Actually had good machines and pilots but this was not widely appreciated at the time or today?
While I have utmost admiration for all things Finnish, I wouldn't consider the Finnish airforce "underrated" at all. We all know about its great sucess against the USSR in the winter war with mostly hand-me-down equipment, as well as its later successes in the continuation war as German allies with a lot of more modern German equipment. Nobody who knows anything undervalues the skill and resolve of the Finns.
The contributions of the Commonwealth countries are often under appreciated.
I guess it depends on what you mean by underrated, and when. If you are looking at air forces most under-rated by their opponents at the time of entering combat, I'd say it would be the Japanese by a mile. At the time of Pearl Harbour most of the Allies thought of the IJN and IJA as myopic midgets flying scond rate reproductions of obselescent western aircraft. The reality was they had the best pilots flying the best aircraft and they spent the next six months wiping the floor with everyone they faced. I can't think of a greater disconnect between peception and reality than that.
Who by? certainly in Britain the Commonwealth airforces and aircrew are not under appreciated. You only need to attend a British Legion and speak to the veterans and you will hear glowing accounts of Commonwealth airmen, sailors and soldiers. In 1939 it wasnt the Commonwealths fight but they didnt let the Old Country down and you will never hear a bad word said about the volunteers who came to our countries aid.
You don't have to look far though to see what I mean by overlooked. There are some people on this forum that consider them nothing but a side show to the USAAF.
What about the Polish AF? Polish pilots in PZL-11 fighters shot down over 170 Germans. Plus look at there contribution in the exiled Polish Air Force in the UK, though they were not using Polish planes, the still had a large impact.
How about the RCAF?
Nobody even acknowleges their existance as an independant entity...they usually just get lumped into the RAF.
Which is total BS.
For example? In addition to all of our guys that were scattered throughout Bomber Command, Canada also equipped, trained, and paid for an entire RAF level "Group" in Bomber Command's force structure. And that's only the tip of the iceberg. Dozens of fighter squadrons , dozens of tac air squadrons, transport groups, maritime air, BCATP (all paid for on our own dime). Nothing much ever in the way of acknowlegment though.
Something wrong with that picture?
I happen to think so...