50,000 people over a 29 year period is less than 2,000 people a year. There are about 5,000 colleges and universities in the USA. There were almost 6 million students. Even if only this population is used as a pool (which it is not) that means if a graduate from only half the college and university graduating classes is selected each year they will meet quota.
Every year in the USA hundreds of thousands of people are reported missing. Most of them are found but this still means that plenty of people disappear every year, plenty to cover 2,000 MP volunteers.
Let's look at a similar organization-Peace Corps
The Peace Corps has had 230,000 Americans involved and their current numbers look like this
Current number of Volunteers and trainees: 7,376
Gender: 63% female, 37% male
Marital status: 98% single, 2% married
Minorities: 32% of Volunteers (excludes non-responders)
Average age: 28
Volunteers over age 50: 6%
So they average about 4,000 people per year.
Its a question of selection. How do you determine who to enroll that will be a good fit for the project and keep its secrets until they are frozen. Once they are frozen they aren't a security risk any longer. The CIA and FBI both recruit and train a larger number of people than the Project. In addition the uniformed services also recruit folks who have special trust placed in them. Yes a tiny fraction of these people turn or just blab, but an amazingly small fraction do that.
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