Jim,
To gain command in a situation like this is not an easy task...
After being screened and "accepted", so to speak, you will undergo a background check the likes of which the FBI and CIA combined can only dream about.
After passing this bit (6-8 months, in my case) you get a one year contract with all the bells and whistles.
If you renew or leave, doesn't matter...you have made the "A" list as far as management, handling skills, and most importantly "discretion". If you leave you will be free to work anywhere for anyone in the mid east...
These VIP operations carry more than the principal, they frequently are hosts to many heads of states, among others....
And the "on call" was non-existant in my case...over 4 and a half years flying a VIP 727, I never received less than 24 hours notice of an upcoming flight....