A few things can be interpreted from the information you gave.Often the ABMC list will provide actual DOD, and not a year and a day, even for MIA's.This appears to be the case in your instance.Since US troops were not in North African theatre until November 1942, I would guess that the DOD shown is correct. It's interesting that there is no unit listed on the AMBC list however.The 12th Air Force operated in the MTO during that period.
Also, since your uncle was awarded an Air Medal, I'm guessing he was a member of an air crew and not ground crew.With his name and serial number you can obtain a Missing Air Crew Report from government sources, which will give you the details of his death.You can also get a copy of his Individual Deceased Personnel File grom govt. sources.See message #2112 on this forum for details.
As an interesting side note to the discussion of DOD reflecting 1 year and 1 day from the actual incident, I took a look at 26 MIA Purple Hearts in my collection, comparing the actual DOD to the date listed on the ABMC list.I found that 73% of the DOD's are listed correctly.All of the 1+1 dates are for Navy personnel, yet a few of the Navy casualties reflect the correct date.
A couple of interesting examples:I have 3 medals to sailors who were killed in the Battle off Samar (part of the Leyte Gulf battles on October 24-25, 1944). Two reflect the 1+1 rule, one shows the actual DOD.
I have one medal to a sailor killed aboard the USS Edsall, which was sunk on 3/1/42.His DOD on the ABMC list is 11/25/45 (!?!).