A post by Bruce about a recent bioterrorism drill based on the USPS reminded me of US Defense Council plans from WWII.
For example, here is an image of The Block Plan for Civilian War Services, a sister association to the Civilian Protection function:
Some more background on the Civilian Protection appears here, as unfortunately I do not seem to have a copy of their organization plan:
This series contains correspondence between the director of the Office of Civilian Protection and officers of local civilian protection organizations concerning the administration of civil defense programs in order to coordinate the protection of life and property from possible bomb attacks. The letters discuss procedural and organizational issues.