Wow, Jemma you are a bit of a bitch aren't you.
Hully, YANBU. For all the reasons you have already stated. Completely get where you are coming from.
The family and friends of course can describe their loved ones which ever way they see as most fitting. Of course this will be more intimate and less formal than colleagues particularly ones who have never met them ie the Chief Constable in this instance.
But the Chief Constable, who is not a friend or a personal acquaintance, describing police officers under his command as "young girls"...
I accept he meant to convey something of the tragic loss of a [relatively] young life.
But to my mind this term is belittling and demeaning to two professional women who died in the line of duty.
It is still horrific and sad if they are described as young women, they don't need to be labelled as mere girls to activate sympathy.
And I have no words for the term "slaughter of the innocents" [Daily Mail, Sun?] just 