An iconic replacement of the US "choccy chip" camo pattern, the 3-Color Desert field shirt was to replace the less effective "choccy chip" pattern.
First production was in 1989, and by 1991, it was in full production. It was often regarded as the "coffee stain" pattern. This would make a great addition to go along with your "choccy chip" pattern (get it, coffee and cookies... haha).
 
These shirts appear to be in great shape. They feature two breast pockets and two waist pockets. They also close via buttons. 
 
Despite the great condition, please expect small tears, fraying, stains, and/or markings.