Pentagon research has been hampered by backlogged security clearances, limited funds to build or refurbish labs and a slow and difficult hiring process.
The veteran's wife captured video of the incident that's now gone viral. She told Military Times that she set up a hidden camera after suspecting abuse.
Thousands of post-9/11 veterans are reaching retirement. Whether the lessons they learned during two decades of combat will be retained remains to be seen.
It marks the first time both chambers approved directing a president to remove armed forces from hostilities since the War Powers Act was adopted in 1973.