Hi Mark,
There are a some common misconceptions about CCKW paint colours. One of the most common being that early trucks used a an OD with a strong yellow tint,while this is completely untrue you see many older restorations in this awful pale green,almost bordering on yellow.
If you want to go by the manuals CCKW's from the factory used at least two different paint colours,TM 10-1269 of Jan 19th 1942 and all previous CCKW manuals give vehicle finish as "Olive Drab-flat,Dupont number 1071-019.
TM 10-1563 of July 1st 1942 and all following CCKW TM-10 manuals give finish as "Olive Drab,flat,Dupont number 1071-050.
As a 1944 truck yours would have the TM-9 series manuals and I don't know if they give details of vehicle finish. The details I have given above are for factory finish,as Degsy says trucks repainted overseas could end up any shade of OD. I have a CCKW hood with original finish and US markings and the finish is a very dark green with a slightly shiny finish.
Matt.