This 9 March 2018 video from the USA says about itself:
Translated from Dutch NOS TV today:
In [Yountville town in] California, a former soldier has shot three people in a veterans’ home. The perpetrator, a 36-year-old decorated veteran who had been stationed in Afghanistan for a year, then committed suicide. …
Veterans who suffer from post-traumatic stress disorder are treated in the home. It is one of the largest centers for veterans in the US. There were about a thousand people, varying from veterans of the recent war in Iraq to former soldiers who fought in the Second World War.
The perpetrator was treated at the center, along with other veterans who have been in Iraq and Afghanistan. A few days before he took people hostage, the man is said to have been expelled from the program, why is not known.