Should an Officer who was non-selected for promotion, and discharged at 16 years of service, reenlist to finish their 20?

Absolutely don’t give away 16 years you could do four years standing on your head.

I would. I saw three MI Aviation CWO4's get put into my MI Officer Advanced Course and then commissioned as O-2s. We voted them to be our Honor Graduates. It was either that or get put out of the force at 16 years service. I've seen several officers enlist to finish their 20 years, most went back in as E-6 or E-7.

When you boil it down the main reason for my nerves to act up and for me to go to the vet psych hospital was very long term unemployment, savings lost in a romance scam which would not have happened if employed and a general downward spiral. I had been ok but just as I was boarding the bus to go home I felt very , well it was hard to stand up. NOW the driver would not let me get one word in as he talked to the lady who just sold her trucking company for big bucks. He had retired from the mil. and from trucking and had only 2 or 3 years more to get his 3rd retirement for driving the gov. bus. YEAH I WAS ENDURING the whole 90 miles back. It took me 30 years to get of the computer suicide list. So, you have completed a big percentage and are still young. H.S. 18, BS/BA 22, Commission 23/24 + 16 = 39/40 years old. 20 civilian years you will be only 60 double retire early.

As for me I am 74 and must wait till 2024 and get elected . to do that I must convince 70 million voters. Then I MUST be as great as my 5th cousin Abe to regain honor this second time. An executive got $20 million for an idea. The US President get $400,000 for managing a Nation, but that's fine. My life would be great. In just one year I can save enough for a fine house in Asia, South Africa, Europe, Central America or here... https://www.youtube.com/watch?v=3HVBhYZGrsM OR just over the border in Argentine Patagonia..... https://www.youtube.com/watch?v=ooBmsgBFn0U

I finally have a good paying job even though only part-time as assistant in public relations and company rep. I found about 2 acres on Lake Argentine for $69,000. For another $250,000 I should be able to build an ultramodern 2000 to 2500 square foot off-grid home on the land. I have sort of an unofficial adoptive family. One who has always been there in the emergency room or as medics took me away calls me Grandpa and the other, a Philippine military woman and solar business owner calls me PaPa. When you are jobless your whole family leaves you.

Lago Argentina / Bariloche https://www.youtube.com/watch?v=XSniaD32HKU

I all depends on whether or not the officer in question can qualify. If there is no age or physical limitation, OK. Enlistment is one thing. Perhaps a Warrant officer commission is better. I knew a former Major from Vietnam, who was a WO4 in the 82nd Airborne Division and he served honorably and I'm certain he was looking forward to his 20 year letter.

Once see what other jobs available in civilian world, will be willing to GO back & serve!…. I kick my butt now, my 20 years would be over…

Is a retirement 4 years away anything to sneeze at, do the 4, retire and smile as you walk away, knowing you will still retire at the highest rank held. Maybe you will like it and end up doing 14 or more enlisted and retire with even more than a POLM (Passed Over Line Major), A POLM is about the only Officer with 16 years of Service, still awaiting promotion.

T.C. Lawrence went from a Colonel to an enlisted man in the British Air Corps because, the Air Corps refused him a commission, but he loved planes so much, so I gather it should be an individual's decision.

Absolutely, don’t just give up your benefits

When I first enlisted in the late 70’s there were a fair number of riffed officers who finished their 20 as NCO’s. I think at that time they retired at their highest commissioned rank.

I'm sure that is a personal and professional decision for every individual to make.
I DO know that I served under a CSM who had been a commissioned officer in Vietnam and was apparently RIFed or not picked up. AND, he may well have been the finest CSM I ever had.
Go figure.