need some help . after ww2 the army switched to a darker olive drab can any one tell me if that color would be appropriate for a m46 patton in korea, a late 50's early 60's m47 patton and a vietnam m48a3 and whick company makes it closest equivalent

If I recall from previous posts the dark OD was also applied to the T26E3 Pershings that were part of the Zebra Missions. As far as a paint match I believe the Humbrol OD is a close match to the dark OD.
Eric