What Did Trump Mean When He Told the Widow of a Dead Soldier, "He Knew What He Signed Up For"?

This week, President Trump made some unsavory comments about how his presidential predecessors handled military deaths while in office. “If you look at President Obama and other presidents, most of them didn’t make calls,” Trump said during a Rose Garden news conference Monday. “A lot of them didn’t make calls.…
Source: What Did Trump Mean When He Told the Widow of a Dead Soldier, "He Knew What He Signed Up For"?