FSA 595. This refers to the deck of Federal Standard Colors used as a reference for US military paint. My information is over 10 years old, and my "color fan" is labeled Federal Standard 595B. Its federal stock number is 7690-01-162-2210. It contains 60 pages of color chips, 2" x 5/8", (550 total chips)indexed by color number, ie: FS 36440.
The address I used was:
GSA
Specifications Section
Room 6654
7th and D Streets, SW
Washington, DC 20407
This cost me $6.00 in 1991. You may be able to find more current info on the internet.
Good Luck
Tom