IATA DGR - International Air Transport Association Dangerous Goods Regulations would be the most appropriate publication to use if you were transporting hazardous materials via commercial air
The most appropriate publication to use if you were transporting hazardous materials from the US to Japan via a maritime vessel is the IMO (International Maritime Organization's IMDG (International Maritime Dangerous Goods Regulations)
AFMAN 24-204(i)
AFMAN (Air Force Manual 24-204 (I))
When transporting regulated hazardous materials from the US to Japan on an oceangoing vessel, the most appropriate set of regulations to comply with are the International Maritime Dangerous Goods (IMDG) Regulations, published by the International Maritime Organization (IMO)
The US Department of Transportation regulations (49 CFR) applies to all shipments of hazardous materials within, to and from the US. Other regulations (those of the country of origin, destination or transit) will apply, in addition, to shipments from or to the US. And if the material is sent by air or ocean vessel, still other regulations will apply.
Small quantities of certain regulated hazardous materials may be carried on a motorcycle, but in general a motorcycle is not an appropriate vehicle for transporting regulated hazardous materials.
The International Maritime Dangerous Goods Code (IMDG Code), issued by the International Maritime Organization (IMO), regulates the movement of hazardous material by vessels in international waters.
IMDG
EPA Form 8700-22
EPA Form 8700-22
Depends. If its transporting a quantity of hazardous materials which requires the display of placards or else is a bus designed to transport more than 15 persons (including the driver), then it's a commercial vehicle at any weight which requires the appropriate class of CDL and endorsements (for a vehicle under 26,001 GVWR/GCWR, it's a minimum Class C CDL), and all logging and HOS regulations apply.
Afman 24-204 (i)