Your not currently in the Corps. I can tell. It’s usually those who havent been in that want to do 20 years. Unless you are super MOTO.

you get 1/2 your paycheck for the rest of your life.

Police and Firefighter pensions are better. and you get paid more

You earn 2 1/2% retirement for every year you serve.

With a minimum of 20 years needed to be vested.

So at 20 years, your retirememnt pay, would be the average of your highest three years of pay.

Retirement is calculated only from your base pay.

Maximum retirement pay is 75% for 30 years service.

Even if you serve more than 30 years, your max is still 75%.