A motive for the shooting by U.S. Navy sailor Gabriel Romero of three civilian shipyard workers has not been determined.
Roger Nakamine is the only gunshot victim who survived the attack last week.
Contracts with private housing providers were focused on ensuring a good return for the companies but don’t require homes be kept in good repair.
Officials took questions from only two reporters – and offered no new information in response – before leaving a press conference.
Officials refused to answer many questions about the U.S. sailor who shot and killed two civilians on the base, wounded another and then took his own life.
The GAO analyzed 32 criminal cases, including at least one with ties to Hawaii, to show how contractors have defrauded the U.S. government.
Joint Base Pearl Harbor-Hickam said the shooter, a U.S. sailor, killed himself after shooting three Department of Defense civilian workers.
Neighbors and government officials say an environmental study is needed, but the Marine Corps has said it isn’t legally required to do one.