High and tight is not required of enlisted or officer Marines. Some sects pretty much require it--it is a point of motivation to many and is nice and low maintenance (in the field, that is -- not going to the barber every week).
All Marines must have 0" of hair at hair line and taper to up to 3" of hair on top. . Of course, Marines are expected to be well within this standard.
It is rumored that "Swinging in the Wing" has slightly less protocol (and slightly more hair) than . . say. . an infantry company. But there are also some major differences. The Enlisted to Officer ratio is much lower (ie, more officers) and the officers have more rank (b/c of all the training before getting to the wing; etc). Obviously ground hard pounders are in the field a lot more, so less hair is kinda nice. . . .
DISCLAIMER. .of course, we can find hair examples on both sides that don't fit that trend. . whew.
That's my 2 cents. GO GET A HAIRCUT -- surely you have other things to worry about!