Blatantly stolen from another thread on here: (aka search is your friend, but here's your answer)
Tell the clerk the list of the FS codes in the HD paint computer is found by going under
"Competitor Color look up" and selecting Federal Standard as the manufacturer then have them enter just the five number code.
http://olive-drab.com/od_mvg_camo_carc.php
Color National Stock Number FS595A Color Code
5 Gallon 1 Gallon
Desert Sand 8010-00-111-8353 8010-00-111-8004 33637
Sand 8010-00-111-8336 8010-00-111-7988 30277
Earth yellow 8010-00-111-8130 8010-00-111-7968 30257
Earth red 8010-00-111-8345 8010-00-111-8003 30117
Field drab 8010-00-111-8129 8010-00-111-7943 30118
Earth brown 8010-00-111-8338 8010-00-111-7998 30099
Olive drab 8010-00-111-8069 8010-00-111-7940 34087
Light green 8010-00-111-8007 8010-00-111-7930 34151
Dark green 8010-00-111-8042 8010-00-111-7938 34102
Forest green 8010-00-111-8010 8010-00-111-7937 34079
Black 8010-00-111-8356 8010-00-111-8005 37038
Military Vehicle Camouflage Paint for Three Color Patterns
Colors for more recent three color camouflage patterns would be from this list of FS595B colors:
Color FS595B Color
Green 383 34094
Desert Tan 686 33446
Black 37030
Brown 383 30051
Aircraft Green 34031
Aircraft Gray 36300