Can anyone explain if this guy I know is pretending to be a LTC?

Perhaps the "BS" in nursing had an affect on his self evaluation of what he did in the Army.

"walks like a duck..."

Army Reserve standards for medical personnel work a little differently. You get constructive credit for time spent civilian side in the various clinical specialties.
It doesn't impact your credit towards TIS or retirement, but it also allows a nurse whose spent a decade working in an OR from being subordinate to an RN who's spent the last 2 years working a medication cart on night shift at the local nursing home while drilling one weekend a month.
While I'm uncertain of the conversion rate, I'm also fairly certain there's wiggle room for specific certifications and experience. At 45, it's feasible your friend has held a license as an RN for 22-23 years. Throw in real world career in a critical specialty... say as an ER nurse in a Level I Trauma Center or as an OR nurse in a cardiothoracic surgical center, along with the professional development accreditations considered standard for that field of practice, and its feasible the USAR saw fit to commission them at a field grade rank. A long time ago, the Chief of Nursing at the Hospital Unit (Surgical) was an O-5, and I BELIEVE she'd been commissioned as such specifically to stand up the unit.

I would bet my left nut he is lying. The only people I know who come in at that rank are the physcians who have a specialty. I have never heard of 101st Reserve Units. He is full of shit.

45 seems old to be joining.nsounds like a bunch of bull. You are an officer, you should know better

Well, the Nurse Corps WILL take you up to 55 years old. I’d get a letter from them (Army and Navy mostly) about once a year (I’m over 55 now). AND if he has an MSN + roughly 15 years of experience, a direct commission to LTC is possible (they won’t start him as a Butter Bar). And it’s POSSIBLE he’s in a medical unit attached to the 82nd. So, the whole scenario is possible. Ask him (DON’T Prompt him) what the Post Hospital is called (Womack Army Hospital) or what unit he’s with. 44th Med Brigade is made up of: 28th Combat Support Hospital, 248th Medical Detachment, Veterinary Service Support, 257th Dental Company (Area Support), 261st Multifunctional Medical Battalion, 1st Area Medical Laboratory, 14th Combat Support Hospital and the 53rd Hospital Center. All this is on the website. Good luck. Keep us posted.

https://home.army.mil/bragg/index.php/units-tenants/xviii-airborne-co/44th-medical-brigade

If his story was any fishier it'd be in an aquarium.

Very Fishy , I would ask him where did do basic at and when he join the service and what was his platoon number was.. If he can't answer any ,he's a fraud and Poser..

You just don't join the Army reserves and become LtCol . Be careful one lie leads to more lies .