What Does Someone Deserve?

For John, BLUF:  What drives salaries?  Nothing to see here; just move along.

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Yesterday I received the following in an EMail:

In today’s USA Today, the salaries of most level one football coaches are listed:

Army head coach--$401,500

Air Force head coach--$882,000

Navy head coach-- $1,514,240

My question—Is it 3x harder to coach Midshipmen than Cadets ???♠  Thus the difference in pay?

Just curious.

Regards  —  Cliff

♠  "Midshipmen" are from the Naval Academy (Annapolis) and "Cadets" from the US Military Academy (West Point).