First lieutenant

[Culfinrandir]

if you look under the website for the 3.4 trailer it shows that the squardons is where you get the promotion but not sure how much of it you have to do

From what I've seen elsewhere, obtained by dubious means, you need have your squadron reach level 40 & be successful in the mission(s) unlocked at that level. I'd expect to see some people reaching level 40 next week but it all depends on how the experience awarded compares with the experience needed to level up.