What are the diffrences between the RAF - ARMY - AND NAVY?

the diffrences id like to know is 1.what are the diffrences in the pysical exams in each force? 2.the pay as a regiment gunner 3.the life style and social side of things 4.the time you must spend in the force before you can leave 5.the pension they offer 6.the death toll rate from 2000 - 2011