Not the 17 that you are looking for but a theory on Q and 17 from a Twitter Twat.
Working Theory…
Why Q?
17th letter
Why 17th?
Extortion 17* -call sign for Chinook shot down in Afghanistan on 8/6/11
38 Murdered
17* Seals (15 from Team 6)
5 Navy Special Op Support
5 Army NGs
3 AF Spec Ops
7 Afg soldiers
1 interpreter
17+5+3=25 Special Ops
8+6+11=25
25=5:5
8/6 is the 7th anniversary
May God bless and comfort these souls.