Numbers:
Here is some information that I found in my files and somewhat remembered from my distant past.
The Army has a finishing specification document, MIS-20007 which covers all ground support equipment. This is/was also referred to as Missile specification.
The earliest version that I still had was a rev "F" dated 1988.
Rev "F" lists a white colored coating as being color # 27875 which is semi-gloss not lusterless. This is what my company used for stenciling data on Patriot missile canisters as well as the launcher assemblies.
Secondly, I found a letter from Rockwell International dated 1983, to the USAF that they needed a color number assigned for an un-tinted white which previously used the #17875. Rockwell always had to get a deviation for having paint produced as un-tinted since it did not match the FED-STD-595 color chips. The USAF obliged and had the GSA issue color number 17925 as un-tinted white.
What all this means is that either color 27875 in semi-gloss or 37875 lusterless could be construed as being correct.
Your paint, Mil-P-52905 is listed as "Paint, Camouflague, Removable". This paint was designed for ready removal using a 5% sodium hydroxide solution and a 2% Methocel solution, basically an aircraft soap solution.
The color white mentioned is 37875.