Except they would get Columbus Day and MLK Day as paid holidays, while you had to sit at home and eat a PTO day, because the work site cannot be used with no government employees there, and your company doesn't coordinate its holiday schedule for on-site employees.
And then they would have some morale event (read: party/picnic) on base, and they could go to it while on the clock, while you were nominally invited, but if you attended it would have to be off the clock.
Then the funding for your project is interrupted. They get furloughed, and will probably be repaid later when the funding is restored, but you just get straight-up laid off, and have to find a new job with zero notice.
But at least you got paid more. That almost makes the crap treatment worthwhile.