They have one job at the academy--winning football games.
I don't have a link to Coach Niumatalolo's contract, but you might find it interesting how many things other than "WIN!" are included in the contracts of Army Head Coach Ellerson and Air Force Head Coach Calhoun.
http://www.coacheshotseat.com/CHSArmy.pdf (paragraph 3.02 -- beginning on page 2 of the pdf)
http://www.coacheshotseat.com/CHSAirForce.pdf (Appendix A -- page 6 of the pdf)
( side note: Calhoun's pension plan is amazing )