My older son was a Marine combat engineer/truck driver and told me how to read these.
They are called Embarkation Codes, and are painted near the front passenger corner of all Marine tactical vehicles and trailers.
C/C is Condition Code. The only two I know for sure are A is new, F is obsolete and will not be repaired if anything expensive breaks. When I visited my son's motor pool (1st CEB) on Camp Pendleton around 2011, all their M939 series trucks were marked C/C F, even ones in like-new condition.
They usually don't have a date attached, in your case (judging by the paint date) that 06/09 was probably supposed to follow REB.
REB. is when it was last rebuilt.
PRES. is Preservation Code, has to do with going aboard ships and how much preparation it received (like sealing intakes etc.). Drive on/off means they were driven on and chained down, no other work done.
P000 and P001 etc. remains a mystery to me. To quote my son "Only the Squids know what that means".
2320-etc. is the NSN of the vehicle
WR CARC 06/09 means it was painted with Water Reducible CARC in June of 2009
Cheers