These resistors were manufactured to the military specification
MIL-R-11, which was cancelled in 1997. I do not have access to the
historical document. However, a similar specification for established
reliability carbon-comp resistors is available here:

http://www.dscc.dla.mil/Downloads/Mi...8/mil39008.pdf

The moisture, lifetime, aging, etc. for an RCR07 should be very similar
to an RC07.