Hi Dana
Have you got an exact title of the squadron book as I found this one very lacking on the units I was trying to research - most were not in it. 3rd Pursuit Squadron, 17th Pursuit Sqdn, 20th Pursuit Sqdn and other 1941 Philippines units. A google search of "US Air Force Combat Squadrons" came up empty
Sure! Try Combat Squadrons of the Air Force; World War II edited by Maurer Maurer. An official USAF publication, it was reprinted by several commercial publishers over the years.
I know it was once available as a download, though I'm not certain if that's still the case.
Thank you Dana and Fubar
That book confirmed what I knew for the period up to late February 42 but shot down my belief of what happened after that.
Now to find some more microfilms and study them
Bugga.