AH-1W paint schemes

i have the 1/35 MRC AH-1W, i just started the cockpit. i want to do a modern OIF scheme, but the manual calls for either the grey green black camo, or desert tan and brown. i see helos now with a low vis camo, all grey, with dark grey MARINES on them. my decal set is only black. do i need new decals, do the grey ones come in the Whiskeys in the Mix from two bobs? and what color exactly is the grey? thanks.