Sets a clear time window for when service in Guam counts for the VA’s herbicide exposure presumption. Service in Guam, including its territorial waters, qualifies only if it occurred from August 15, 1958 through July 31, 1980. It keeps American Samoa (and its territorial waters) as an included location under existing law.

This presumption makes it easier for eligible veterans to get disability benefits for certain diseases tied to herbicide exposure, because they do not need to prove individual exposure. It may also affect survivors’ claims connected to a veteran’s service in these places.