Alan Rockoff (portrayed by some guy named Malchovich? in the 'Killing Fields) was a member of the South east asian pictorial center prior to freelancing in Cambodia, kept a Swedish K in his locker at the 221st signal company in Long Binh, but can't remember if he ever carried it in the field. As I remember it was green.
If my memory is correct (BIG IF) I was at Long Binh for less than a day after landing at Bien Hoa. The K we had was blued and looked like new. I did not carry it; instead I ALWAYS carried Colt Detective Special and (in a vehicle, an early M-16 and a short barrel Win. 1897), and (depending on the situation) a 1911 and some frags. Spent too much time in the RSSZ.