A little light sleuthing on "Mike" Flynn's d.o.b.

News of Michael Flynn's resignation as President Trump's National Security Adviser sent me searching for his date of birth so's to do a quick check on possible astrological correlation. His date of birth, beyond month and year isn't available. "December 1958" in Middletown, Rhode Island is all Wikipedia and other websites reveal. 20th century Ephemeris to the ready, with a piece from The New Yorker, November 2016 to hand I shall do a little light sleuthing!

The Disruptive Career of Michael Flynn, Trump’s National-Security Adviser
by Dana Priest

SNIP only:

A lot of reporters and other civilians found Mike, as everyone called him, refreshing. A plucky Irish Catholic kid from Rhode Island, he wasn’t impressed by rank. He told his junior officers to challenge him in briefings. “You’d hear them say, ‘Boss, that’s nuts,’ ” one former colleague said. The colleague asked not to be named, as did others I talked to for this story, either because they wanted to maintain a positive relationship with Flynn or because they did not want to criticize the incoming Administration. “When he would walk in a room, they would look up like little dogs. They just loved him.”

Flynn broke rules he thought were stupid. He once told me about a period he spent assigned to a C.I.A. station in Iraq, when he would sometimes sneak out of the compound without the “insane” required approval from C.I.A. headquarters, in Langley, Virginia. He had technicians secretly install an Internet connection in his Pentagon office, even though it was forbidden. There was also the time he gave classified information to NATO allies without approval, an incident which prompted an investigation, and a warning from superiors. During his stint as Mullen’s intelligence chief, Flynn would often write “This is bullshit!” in the margins of classified papers he was obliged to pass on to his boss, someone who saw these papers told me...........

In December 1958 Sun was in Sagittarius, 8 to 29 degrees, until around 23rd, then moved into Capricorn. Mercury was in Sagittarius all month with retrograde motion included. Venus was in Sagittarius until 15th, then into Capricorn. Mars was in Taurus all month with retrograde motion included. Jupiter in Scorpio all month. Saturn in Sagittarius between 25 and 29 degrees. Uranus in Leo. Neptune in Scorpio. Pluto in Virgo.

From the above paragraphs, and from the full linked article, I got more of a Sagittarius "vibe" than Capricorn, though initially, and from his facial appearance I'd have guessed Capricorn. Even if his birthday were in late December with Sun in Capricorn he'd still have Mercury and Saturn in Sagittarius. I suspect that's most likely - birthday 23rd or later, Capricorn's staid solidity tempered by Sagittarian risk-taking, hot-headedness. If that be so, it'd also mean that transiting Saturn (restriction, limitation, career) currently at around 25 Sagittarius would likely be conjunct natal Sun. President Trump's natal Moon is at 21 Sagittarius, by the way - not surprising that both are, and recently have been experiencing challenges.