They said at the time of Ms Brennan's death she was subject to general observations, which meant she was allowed to leave the ward unescorted.

BBC: The sign outside the Bradgate Mental Health Unit.

Besides a lack of guards, NATCA said in some cases ID badges aren't being worn, unescorted visitors can access towers and vehicles can drive up to the base of towers.

CNN: Union claims security lax at many air control towers

Their striking power lies in their air wing (in the case of aircraft carriers, although in the MISTRALs it will lie in helicopters and infantry vehicles as well as the troop component) and they almost never go anywhere unescorted.

FORBES: Marco Rubio's Standard, Predictable, and Utterly Conventional Russia Policy: Been There, Done That