“It's disturbing you have to file a lawsuit to get the Army to follow its own regulations,” a retired Army officer and immigration lawyer said.
Austin was selected over Minneapolis, Boston, Philadelphia and Raleigh, N.C.
The overhaul will create a new power center in the Army.
The battle over a flag has cost Larry Murphree hundreds of thousands of dollars and consumed years of his life.
Cpl. Joseph Maciel was killed in an insider attack, U.S. military official said.
The incident marks the first combat fatality for the U.S. military in Afghanistan since April 30.
A Navy official with knowledge of the situation said Murphy had started discussions with the service in an attempt to return.
The 58-year-old initiated the fire in the middle of a news conference.
It marks at least the second time that the Trump administration has looked to the Coast Guard to pay for other Homeland Security missions.
Three bases in Texas and one in Arkansas have been considered as part of the proposal.