admiral sullivan exhibited an exceptional military career serving the mcrn for over 20 years. her leadership skills, steel composure, and sometimes ruthless tactics, made her an asset during the unn-mcrn cold war, which helped her climb the ranks and achieve the position of an admiral. she commanded the mcrn donnager-class hayate primarily in the jupiter ao, whose home base was hecate.
during a round of negotiations with the unn, at nearly the start of her career, she met zeke beckett, a junior grade lieutenant of the unn. despite their positions and histories, they fell in love and it was not long until zeke defected and joined mars. it was a long journey until he was accepted into the martian navy, and during that time they'd kept their relationship a secret. after a couple of years, they were able to get him transferred to the hayete where he served for the rest of his career as a lieutenant. (pre s1-s3/pre series to a.baddon's gate)
during her time on hecate base and because of her rank, she acquainted winston duarte who was in charge of the base. something was going on underneath the scenes, but the earth-mars war and later the discovery of the ring gates took most of the focus in the area. at the same time, mars was starting to collapse and the numbers didn't add up. ships and equipment went missing as martians dreamed of fleeing to the nearest habitable planets. she noted the disappearances to her upper ones on hecate, but it seemed to slip under the rag. (s4/c.ibola burn)
around the same time, on her last run on the hayete, she was part of an insurrection that nearly re-inflated the earth-martian conflict. around saturn, two martian ships seemed to engage in battle with a unn ship. having no knowledge of those ships being a part of the same fleet as hers and knowing of the ship disappearances, she ordered for the destruction of the rogue ships, while surrendering to the unn ship. (timejump between s4-s5/pre n.emesis games)
after that, she was used as a scapegoat for the insurrection and trialed for treason for engaging against mcrn battleships. her connection to zeke was used as an accusation of espionage for the unn for fifteen years. still, they couldn't find evidence to prosecute him, so zeke was simply generally discharged as a martian citizen after fifteen years.
with her dishonorable discharge, vera fled to the asteroid belt and cut all ties with her loved ones, to prevent them from being targeted all the while, the threat of the free navy and the laconian dream grew under mars nose. (s5 and after/n.emesis games and after)
extra: after d.uarte makes his move and closes l.aconia, and while the transport union is built. they are looking for sullivan, to serve as a possible tactical advisor for whatever intel she has on him. (post s6/p.ersepolis rising and after)