Exceptions. U.S. Navy vessels, U.S. Coast Guard vessels, or foreign warships carrying any amount of explosives in magazines as part of their armament may enter an MPA port facility without securing a permit. A contractor may introduce in the Port explosives in such amounts as are reasonably necessary for construction and repair if the contractor obtains a permit as required by Regulation .06A(2) of this chapter. A person may not introduce in the Port: Prohibited commodities, unless the US DOT has granted an exception for its movement; Class 1, divisions 1.1 and 1.2 explosives, as defined in 49 CFR §§173.50 and 173.53, weighing more than 100 pounds net explosive weight, although in-transit Class 1, divisions 1.1 and 1.2 explosives in any amount on board a vessel are exempt from this requirement if the explosives are not moved or disturbed while the vessel is in port; Class 1, divisions 1.2 and 1.3 propellant explosives, as defined in 49 CFR §§173.50 and 173.53 weighing more than 2,500 pounds net explosive weight, although in-transit Class 1, divisions 1.2 and 1.3 explosives in any amount on board a vessel are exempt from this requirement if the explosives are not moved or disturbed while the vessel is in port; Any blasting agent, ammonium nitrate, or ammonium nitrate mixture, except as permitted in Regulation .06A(9) of this chapter.