Running on the other anon's theory about Trump doing stock market hints, I've figured what Q meant by "D5". Previously, I noted it referred to the Trident D5 missile - a system that Thesera May is planning to replace very soon.
As it so turns out, the D5 is made by Lockheed Martin, and Thesera's husband, Philip May, is a senior executive for Capital Group, who have stocks in various companies, but namely, thousands in Lockheed Martin:
https://evolvepolitics.com/theresa-mays-husbands-investment-firm-made-a-financial-killing-from-the-bombing-of-syria/
As 'mere' coincidence has it, the rush to war with bombing Syria - supported by Trump, Q and Thesera - funnily enough involved using cruise missiles.
Produced by none other than, err…
…Lockheed Martin.
(Their stocks shortly went up after the bombing of Syria occurred. Methinks the stocks in the D5 missile are going to go up soon and that's an insider trading hint, which I might point out is illegal under SEC rules.)