Chances of getting into usmc mos 0321?

You will never be promised a spot in recon, you will be given the opportunity to take an indoc and only the top few who p will be chosen. Get ready to be a grunt for a while, many recon units require the rank of at least lcpl, and at least one deployment under your belt. Recon will also hold indocs in SOI for those with high rifle and PFT scores for Marines without the rank or experience, but generally its the ones right out of SOI that don't make it through basic recon training. Its not all about being physically fit, there's a lot to remember and you need to be mentally tough.