Hey, if you guys are happy and all is smooth while you're there I don't see why you can't get engaged! Collect all the stuff while you're there, photos with her family also would be great (USCIS likes to see that). Have her fill out a G325 and sign it (you need her original signature) and get copies of her birth certificate and her passport. This is just so she doesn't have to mail it to you from Morocco. I'm very paranoid about mailing documents lol.
Many of us on here have done this process without lawyers. Immigration lawyers charge such high prices because this is tedious work and every word and comma needs to be checked. But with the help of the community here I assure you, you can succeed in this journey.
The fiance visa, K1 is a quicker process than the marriage visa, with the marriage visa she won't be able to enter the country for a while, I think about a year so a fiance visa is slightly quicker in that sense. It also depends on the state where you live at the time of filing, if you are lucky enoug to be designated to California Service Center, your journey for a K1 will be A LOT quicker.
One of the requirements for a K1 is having met in the past two years, so until you actually meet each other and collect proof of visits, and have photos together, it will be very difficult to get an approval.
Since you are a Marine (and by the way thank you for your service to our country!) you might be able to have your case expedited, I don't think you need to be on active duty for that.
So my humble suggestion would be to go and meet her, meet her family, and go from there.
Best of luck!
