wondering if its possible for me to marry while transitioning to ft. Campbell from ait or when the earliest i could get married would be?

The Army can't prevent you from getting married. But it will certainly be a lot easier and less complicated on the back side if you wait. If you get married enroute and show up with your new wife, you will find yourself broke, possibly homeless for a while, and place a lot of unneeded stress on your new spouse.

Do not get married until you have settled into your new unit!! You don't want to drag her into a new lifestyle until YOU know what is going on. Your unit does not have to make time in the OPTEMPO for your married life. Recon 1st- cost of living, location of housing on/near post(depending on the unit/MOS- you could be subject to periodic 2 hr recalls). Jobs for her etc. You should be building up leave time-- once you have the answers and YOU BOTH discuss them, then take some leave time (when available) and get married and start her transition.

You can get married when ever you want in the army they are family oriented. You have to put in the correct paperwork at the finance office as soon as you get your marriage certificate. Have them backdate the pay from the day you got married.

This is probably too late, but I'll chime in because I have seen this scenario.
On 2 different occasions I had brand new PFCs show up at their first duty station with a brand new wife in tow. No money, no plan. It did not present a good first impression, and it took a lot of other people's time getting them situated. That is not how you want to start your career.
If you are ready for a lifelong marital commitment, a few more weeks to get things lined out, i.e. where are you going to live, is worth it. It will be in everyone's best interest.
If her name is Honey and she is s stripper, call it off immediately.

You can get married in between but think about the stress you've added to your first PCS, especially if she is coming with

CAN you?
Yes
SHOULD you?
I don't know your situation, but I have seen this movie before, and it almost never has a happy ending. I advise you to report and get settled, and if you are still wanting to get married, give her the ceremony she deserves and do it right.

All joking aside, When I first got to Bn I went home on a 3 dayer and picked up fiance, brought her to Hunter AAF, got an apartment on the beach, then deployed for the next three months. It was hell on her. She knew nobody, couldn't find her way around, had no rights as a spouse, nothing. If you want, marry her and leave her at home till you are established, all the paperwork is complete, she is enrolled in DEERS, has an ID card and you have established housing. If it was truly meant to be, it can wait a little while longer.

Don’t do it!

I've seen good and bad points listed here. Obviously these are all recommendations. I recommend getting married however leave her behind on the PCS to your unit. Once you get to the unit fill out all necessary paperwork then bring her over. The reason why is if you bring her and she's not in your file everything is out of your pocket for her accommodations and living space until she is registered. I recommend getting married before the move though because it will be harder to get married when your at your duty station due to distance.

Usually, new soldiers go to units that are filling the ranks that are deploying soon. Do think marrying your spouse, when your unit is in intensive ops getting ready to deploy (so you won't be home all that much.) Then leaving her for a year or more, away from home and away from her family support network; is looking out for her best interests?

Oooooh man