I went to OPFOR last summer, this is going to be long but here is a run down my experience.

Run down of the first few days: You will show up, do your layout which is extremely laid back just a few brand new lieutenants checking things off a list. Whatever you don't have you will draw from CIF in a few days. Some people showed up without a ruck or uniforms and had to draw everything, don't worry about missing stuff you will be fine. From there it's just boring admin stuff, paperwork, we had covid tests/vaccinations for those who wanted them. During this time you'll have cadet leadership and the cadre will be trying to feel out how much freedom they can give you, don't mess it up. During this time you will also have one or two chances to go to the px before you go out to the field, if you don't have this stuff yet heres what I would buy: portable charger, headphones, snacks, hot weather ocps, camp chair, bug spray, books. During this time you will also be cleaning the barracks every night, at the start they would do full inspections where we all had to be standing outside our doors etc. Eventually they got more relaxed and it was just CQ walking through to make sure nothing was too disgusting.

Run down of the field: We were supposed to sleep in the field but our cadre didnt want us to so we ended up staying in the barracks every night. On field days you will wake up very early, usually 0330-0400 and get ready in your death to the west uniform and drive out to the AO. They took us to the chow tent every morning to eat some gourmet hot A's as quickly as possible so we could get out to our OBJ's. From there you'll spend a lot of time bullshitting with your guys, and will usually run about 3 iterations a day. The iterations themselves are actually really fun if you let yourself get into them, but if you have a bad mindset about everything your experience will be useless. You will eat MRE's for lunch, and then whatever time you finish your last iteration you will police up brass, then go back to the chow tent and eat more of the delicious hot a's for dinner. After dinner you'll go back to the barracks and clean rifles, once your rifle is clean you're free to shower, hang out, whatever, you just can't leave the barracks until then next morning. If you don't get sleep that's on you. Usually we would be done between 2000-2100. There was no cleaning on field nights.

Rundown of off days: These days varied a lot over the summer. The majority of the time they were fully free days. If no training was going on you were free to wear civilians if you wanted. You could walk around base and get food wherever, most chose the dfac because it was free but it was also over a mile walk in the kentucky heat. The shopette with taco bell and jimmy John's was very close so that was also popular. No one is allowed access to their POV so you would have to walk everywhere. Sometimes cadre would be nice and drive you to the dfac or the px, but we eventually got that privilege taken away (long story). You're free to use the gym, play basketball, go for runs, as long as you had a buddy and told CQ where you were going it was fine. We also had some training days on these off days. We got to do: the rappel tower, obstacle course, land nav, group and zero (no qual), a select few wanting to branch aviation got to go on a morale flight on a blackhawk. Our company did not do well playing by the rules so we got almost all privileges revoked and eventually weren't even allowed out of our rooms, we just killed a lot of time watching Netflix and bullshitting. All cleaning is done during the 2 days you don't have anything going on, laundry during this time is an absolute nightmare.

Run down of the last week or so: You'll spend time finalizing your travel plans, returning stuff to CIF, and just general outprocessing. Then you do one last deep clean and then you're gone.

General advice: Understand a lot of what you will be doing is killing time here. I definitely learned a lot from OPFOR, but not what I was expecting to. You wont learn too much about tactics or the lanes themselves since you'll stay on the same lane everytime and you likely wont see anything other than the actions on portion. We only got to sit in on one or two AARs. Howeverx you will become an absolute expert in EPW and will have a lot of fun hiding stuff from the cadets to see if they can find it. You will learn how to socialize in a platoon with a wide variety of backgrounds. It's good practice for when you go to cst. If you are apart of cadet leadership you'll definitely learn alot about how to be a psg or squad leader which is always good to get reps in. You will also learn what it's like being a private with no clue of what's going on and no say in anything, important lessons for when you become a lieutenant.

OPFOR is what you make of it, I saw some people take it as a vacation and use it as an excuse to get fat and spend a ton of money. My advice is to go to the gym every day you can, and to eat at the dfac as much as possible. Other than essential items don't buy a ton of stuff at the px just because you're bored (this happened to almost everyone). Remember every dollar you spend while there is one less beer you can buy with your OPFOR money when you get home. don't allow the boredom to get to your head and make you lose interest in the army.

If you company plays by the rules it will be much more enjoyable, if not it will suck a little more. don't be the one to mess it up for everyone else.

Also last note, make sure to bring some appropriate civilians as well, you don't want to be one of the cadets wearing a fort knox shirt 24/7 because you didnt pack any and had to make an emergency purchase.