@fohjoffs
education (4-year degree) and passes OCS
I believe you are mistaken on one or both parts.
It is required to have the equivalent of a Bachelors Degree, not 4 years of education. During WWII, and at other times, both Annapolis and the USMA at West Point have graduated officers with three years or Less education, but still granted a degree and an Active Commission.
I was in ROTC, and for both persona;/family reasons, and sensing the coming downsizing of the armed forces in the 1990's, I opted to go into the National Guard, after serving on Active Duty, and then a couple of years of ROTC. Most of my peers reverted to NCOs by the end of the 1990's. Several like me reenlisted after September 11th, 2001, and fought in the GWOT as NCOs (including several Marines). A couple of my peers were (again) Commissioned/restored to their Rank as an officer. One had been denied a Commission in the 1990's do a nit noid incident as an Enlisted Man; was reduced from Sergeant to Corporal, and transferred to the IRR; he was involuntarily recalled to active Duty as a First Lieutenant! He later received further promotions for his good service. He never received an explanation for his Commissioning...
Did you mean the OBC Officer Basic Course for Infantry (or Artillery, etc.) when you typed OCS (Officer Candidate School)?
OCS is for Enlisted personnel who have been selected for an opportunity to become an officer, should they graduate from OCS.
The OBC is for graduated of the Service Academies, OCS, and ROTC programs.
Names of particular schools in the various branches of the armed services change over time, and sometimes change back.
For example: when I was a first in the US Army the initial school for prospective Sergeants (and sometimes Corporals) was the BLC: Basic Leadership Course. Then it became PLDC: Primary Leadership Development Course, and then it was termed the WLC: Warrior Leadership Course.
Edit: After some more research, the USMC has 3 Different OCS programs. 4 Weeks for graduates of the USNAA (US Naval Academy Annapolis) {Marine Option}. 6 Weeks for graduated of an ROTC {Marine} program [the US Army typically has a 6 to 8 week OBC Officer Basic Course for Infantry, or Armor, or Artillery, Engineers, etc. similar to these 'abridged' USMC OCS Courses.] and 10 Weeks for select Enlisted personnel; similar to the US Army OCS program. It seems odd to me that they, the USMC, uses the same name for three significantly different programs. But then the Marines call a Floor a "Deck" and other oddities. [end edit]
Also, as I mentioned in an earlier post, just because a thing has not been done in a long time, doesn't mean that it could not be done. However, if you include it in a story, even if it is possible, it may strain plausible disbelief.
While no one in the US armed forces has received a "Battlefield Commission" since the conflict in Vietnam, it is still possible for that to be done.
Direct Commissions have occurred, recently. In addition to the Commissions granted to some cyber-security / "AI" experts c.2024; also during the administration of POTUS Biden, his son was granted a Direct Commission to O-3 Lieutenant in the USN (or, perhaps O-2 LT jg; I have read both in various sources).
Actor (and former SSG USMC) R. Lee Ermy was promoted to Gunnery Sergeant, and several Cartoon Characters have officially been granted Official Ranks in the USMC.
In one of his novels Tom Clancy had a USCG CPO granted a Direct Commission. According to what I have read that hasn't happened since WWII, but it is possible, however, unlikely. In the novel a US Congressman (or Senator?) is responsible for pushing the authorization through. (To O-3 Lieutenant, as "it would be silly to make such an experienced sailor an Ensign") {In WWII numerous veteran NCOs were promoted to O-3 Captain in the US Army.}
In a story I have written, I went down the "rabbit hole" of Warrant Officers in the USAF. As I recall the last one retired in the early 1980's, and there very few in the 1970's. The USAF was getting rid of Warrant Officers in the 1960's. It seems, but I have seen no "official" proof, that it was a response to the US Army having WO pilots for helicopters. The pay grade and Rank(s) exist, authorized by Congress, but the USAF hasn't assigned that rank to anyone in decades.
There are several ways that Congress, or POTUS, or the Secretary of the Air Force could grant such a rank to a member of the USAF (or directly upon a civilian). Not likely in opposition of the "unified" opposition of the senior Generals of the USAF. But possible.
If I was unclear in earlier posts, I apologize. As far as I know, no one in some fifty years has received a Direct Commission in the USMC (outside some cartoon characters, and they may have gotten NCO ranks; I will check later.)
Largely because most such Direct Commissions are granted for Chaplains, Doctors, Lawyers, or other technical experts, that the USMC tends to get from the USN; although, in the past, some were given to people for Combat Arms.
Again, however unlikely, the Congress, POTUS, or the civilian leaders of the Pentagon, could force the USMC to accept an individual (or multiple people) with a Direct Commission.
In 1903 POTUS Roosevelt wanted Captain Pershing (a Major of Volunteers in Cuba) Promoted to the rank of full Colonel; but the senior Generals of the US Army demurred. In 1905 Captain Pershing married the daughter of Senator Francis Warren (R) Wyoming (also a recipient of the Medal of Honor in the Civil War); later that year POTUS Roosevelt Promoted Captain Pershing to the permanent rank of Brigadier General.
POTUS Roosevelt also Promoted Major Tasker Bliss, as well as Captain Leonard Wood (who had commanded the 1st Volunteer Cavalry aka "Rough Riders" that "Teddy" had been the XO of the Regiment), and Captain Albert Mills; all to the rank of Brigadier General(s).
In the early stages of WWII LTC Dwight D. Eisenhower was promoted to the (temporary) Rank of Brigadier General of the Army of the United States (effectively a "Reserve" rank); he was finally granted the Substantive Rank of Brigadier General by Congress in September 1944 (in recognition for the success of Operation Overlord on June 6th 1944, and the subsequent breakout in early August).
In the 1990's the Governor of the State of Washington, promoted his friend (and a substantial campaign Donor) from the rank of Major in the US Army National Guard, to Brigadier General, and made him the Adjutant General of the State of Washington. The Pentagon did not approve of the promotion, but POTUS Clinton, as Commander in Chief, did not oppose it. So, the fellow remained the Adjutant General, and wore the Star of a Brigadier General; but the Pentagon and much of the Active Duty US Army regarded him as a Colonel... It resulted in several awkward situations on Fort Lewis, and other facilities (McChord and Fairchild AFBs, and the Yakima Training Center) where he was conducting his official duties as AG, and wearing the rank of BG...
So, what is Possible, is not necessarily plausible.