To amend title 38, United States Code, to establish a presumption of service connection for certain cancers occurring in veterans who served in the Republic of Vietnam and were exposed to certain herbicide agents, and for other purposes.

Presumes to be service-connected, and therefore compensable through veterans' disability compensation, cancers of any tissues through the opening of the gastrointestinal tract to the end, becoming manifest to a degree of disability of 10% or more.