The CA has nothing to do with California or CARB. Military Scepter cans are not CARB compliant. The military does not bother with CARB anywhere.
Scepter is a Canadian company and CA probably just relates to that, since the country code for Canada is CA. Internationally IL is Israel, not Illinois, CO is Colombia, not Colorado, MO is Macau, not Missouri, etc. Just because 'CA' means California to the USPS doesn't mean that's what it means everywhere.
The POL is Petroleum, Oil & Lubricant. That's a standard military acronym, means anything related to fuel, grease, oil. For example, the guys who load fuel on planes are called POL Airmen.
"Why does the U.S. care which flag will be hoisted on a small piece of land thousands of miles away?" -- Ron Paul