What will the prior service process be like for a Marine heading into the Army?

I have known a lot of prior service marines. The only time they’ve been sent to Lost in the Woods was because the went from infantry to combat engineer or construction engineer. If they are sending you there then your recruiter has pulled some shady shit. You should read your contract carefully and if it’s not what you want, raise hell with your recruiter! However, being a combat engineer is the shit, in my biased opinion!

Oorah brother. I'm a prior service Marine as well. I completed my 4 years active anand 4 years IRR. I was with 1/12 on MCBH. I got out and joined the Army 7 years after. I only have 2 years in the Army so far. I kept my Cpl rank when I joined the Army. I got promoted from Cpl to Sgt within a year and a half. But when I signed up, I was told that I would have to take whatever was given to me, since I was prior service. I wasn't able to put down 3 choices, like when I enlisted in the Marines. So when I got to MEPS, I said yes to the 92W MOS and I got stationed in my home town. I signed my contract and took the oath on a Saturday and then reported in on Monday. Yes, within that same weekend!...There was no class that gave me a quick run down of the Army Ways. I've been learning as I go. It took my unit about 4 or 5 months to get my service uniforms and TA50. I still dont have a dress uniform..lmao... Either way, because we are Marines, we dont have to worry about doing anyone else Boot Camp. And when it came to my MOS school, I did a 4 week crash course (re-class) instead of a 13 week course like a new Soldier would for 92W. At that time, because I wasn't prior Special Operstions and/or because my GT score wasn't a 110 or higher, my only option was the Army Reserves. I was told there was no waving my GT score even though it was a 107 (3 points of a difference!!). So I'm currently in the Army Reserves, but currently awaiting my orders to go Active Guard Reserves (kind of like active duty). Active duty is what I wanted from the beginning. In a way I feel like my recruiter fu#$ed me over. He never told me of the criteria in order for prior service to be accepted into active duty. Being Infantry may be a little different, but because every Marine is a rifleman, they may send you to a crash course infantry school and then you'll return to your unit. I cant think of anything else to inform you on. I hope this helps. Good luck!

You shouldn't be going to Leonard Wood if you're going Infantry. You might not even need to go to Benning for Infantry AIT since all Marines qualify as Infantry first. Infantry in the Army isn't any different. Battle drills look the same everywhere.
For commissioning, finish your bachelor and apply to OCS. The prereqs are released annually so the requirements change a bit from year to year. Start early, there are maximum time in service restrictions working against you.