Negative sixty eight years[1]. Oh, you didn't mean the private military contractors, of which there were about 250k involved in the iraq and afghanistan war, slightly more in total than deployed troops at any given time.

Many ultra-high-net-worth individuals hire them. It's no secret, they've been doing it since the 60s when kidnap and ransom insurance started being a serious thing, and it's only intensified over time. There was an interesting "bolt hole" real estate listing that claimed years supply of food, water, housing etc. for a "company sized group of security contractors" as an amenity.

[1] G4S, the largest PMC company, founded in 1957