46 C.F.R. § 148.25 – Activities covered by a special permit.

(a) Each special permit covers any shipment of the permitted material by the shipper and also covers for each shipment—
1. (1) Each transfer operation;
2. (2) Each vessel involved in the shipment; and
3. (3) Each individual involved in any cargo handling operation.
(b) Each special permit is valid for a period determined by the Commandant (CG-ENG-5) and specified in the special permit. The period will not exceed 4 years and is subject to suspension or revocation before its expiration date.