Here is yet another take on D5 from the anons.
“Q recently brought up the missile at Skunkbay again. More recently, they brought up D5. In the past, it refered to either a chess move or an avalanche. However, there is another meaning of D5. A submarine launched missile, the Trident II D5.”
https://en.m.wikipedia.org/wiki/UGM-133_Trident_II
AND here is yet another D5 reference brought up by an anon.
“The first event of the D5 was held in London on 9 and 10 December 2014 with delegates from the five founding nations attending, as well as the United States, who were there as observers; the event was hosted by the UK’s Cabinet Office minister Francis Maude
https://en.wikipedia.org/wiki/Digital_5
D5 can have multiple meanings, & seeing the players involved in this i think its worth noting….”