The Hawaii National Guard Enlisted Association helped Councilman Ernie Martin craft a bill to give military homeowners a $120,000 exemption.
Defense Secretary Jim Mattis announces the change at Pearl Harbor as he welcomes a new commander.
Hawaii is second only to Virginia in the amount of money that flows into the state through Defense Department spending.
The military has a long-term lease to conduct live-fire exercises on nearly 23,000 acres of Pohakuloa Training Area on Hawaii Island.
The Navy is working on a 20-year-plan to reduce the risk of leaks and fuel contamination from giant fuel tanks on Oahu.
A classic retaliatory lawsuit was filed after she raised concerns about possible housing contamination at Marine Corps Base Hawaii in Kaneohe.
The interceptor was launched from the Pacific Missile Range Facility on Kauai.