Few points:
1) When CX employs labor in the US, they are legally obligated to abide by the laws in the US. That includes USERRA. It does not matter one iota that CX is a Hong Kong company.
2) Wrt hiring future US military, I highly doubt there are many applicants as there are plenty of proper jobs in the US. Besides, CX has shown a strong preference towards young, spikey haired office workers over actual pilots with meaningful experience. That alone discludes all US military pilots.
3) The circumstances of the FA-18 ejection are totally irrelevant to this case. That is confidential information shared at the discretion of the US Navy. That said, I'm sure flying ****ty, unstable freighter rosters didn't help the pilot avoid circumstances leading up to the ejection. I certainly would not want to be flying fast jets based on my fatigue levels most days.