Name names. Investigate under penalty of perjury, and the like. Given the late 40s, there are probably few left to subpoena. So maybe not so simple.
That information is "out there", but I don't recall it. If you really want to know, I suggest reading Kevin Randell's material. I'm sure military records would list the chain of command above Roswell. It would be very highly placed since that was the 509th, the unit that bombed Hiroshima and Nagasaki and was the only nuclear capable wing at the time.
I suppose you regard the personal testimony of those particular officers as unreliable.
The only one I communicated with was General Jesse Marcel. He assured me that the craft was ET in origin and that a coverup was ordered from above.
When I asked him how he managed to endure people thinking he was a liar, he said he just never talked about it. He would have never made General had he done so.
It seems Generals Nathan F. Twinning and Dwight Eisenhower became involved very early in that incident.
Gen Curtis LeMay was probably the next higher office above Roswell.
These documents have been analyzed several times by hoax/no hoax researchers. Documents regarding those analysis are available on that site. The arguments which favor authenticity appear to be better thought out and researched than those claiming hoax.