I got my hands on a couple of old articles that I had gotten from my dad many years ago. (He copied them from a magazine which I don't have any information about, but both articles are entitled "Color 'N Camouflage). And unfortunately, neither article has a date.
They have some slightly conflicting info. One talks about the MASSTER scheme, indicates it was initiated in 1972 for 2nd Bde, 2nd AD. It says the Army adopted the revised program in March of 1974. This scheme calls for 45% Forest Green (FS34079), 45% Field Drab (FS30118), and only 5% Sand (FS30277) with 5% Black (FS37038).
However this is NOT the scheme which was used.
The other article mentions a "new system of vehicle camouflage now in effect within the US Army's Seventh Army in West Germany", but gives no other reference information.
This scheme also calls for 4 colors, however, it specifies that Brown (FS30117) is most prevalent at 34%, and Sand (FS30277) is next at 30%, followed by Green at 27%, and finally Black (FS37038) at 9%. This also mentions that the bumper numbers are to be applied in white.
This is the scheme which was actually used. There are patterns shown for the M113 in both articles, and it is clearly this second pattern which was used, as the Sand color was quite predominent in the actual scheme, WAY more noticeable than the 5% shown in first article.
The only thing I'm not certain of is the Green. The article says it should be Green FS34127, however, I have found that a Medium Green, FS34102 seems to look better. (They're not too different, I just think the FS34102 is a better match.)
I've used these colors in Model Master Acrylic (Earth Red 4707 for the FS30117, Armor Sand 4711 for the FS30277, and Medium Green 4734 for the FS34102) and I've been very happy with the results. Unfortunately other than a couple of old photos of my M577, some M109s, and M548s, (and the M113 in the article) I don't have the pattern charts for any other vehicles in this scheme.
As far as the timing, I know we replaced our short tube M109s with the long tube M109A1 in the summer of 1974. I know that when we went to Graf in May of 1974, all of our vehicles had been painted in this scheme, as I have some photos of my FDC track when I was FDO that year. I also have one shot of the gun line in the motor pool in Baumholder with half the guns with short tubes and half with long tubes and everything is painted, so that photo is from about July of 1974. I don't know when this scheme was replaced in Germany, but it was after 1977.
Tom