Send in the Marines

I was thinking that it would be nice to see what others thought of the
Marines, below is just a portion of what i am working on, but I was
wondering what to put in for the 5th level special ability? I have
misplaced my star wars book so I not have the word for word description
for Heroic Surgem (which I thought would be an excellent
possible  ability for 5th level, would anyone be willing to send me feat
Heroic Surge). Also is 5 level sufficent for a Marine prestige class?

The Marines 
       
     Base
     Fort
     Reflex
     Will
      
     
      Level
     Attack Bonus
     Save
     Save
     Save
     Special
     
      1st
     +1
     +2
     +0
     +2
     Mettle
     
      2nd
     +2
     +3
     +0
     +3
     Bonus Feat
     
      3rd
     +3
     +3
     +1
     +3
     Stanch
     
      4th
     +4
     +4
     +1
     +4
     Bonus Feat
     
      5th
     +5
     +4
     +1
     +4
      ?
     

Stanch (Ex): The marine automatically stabilizes his wounds when his hit
points drop below 0. He passes on if he reaches -10 hit points.

Mettle (Ex): At 1st level, the marine gains the ability to shrug off
magical effects that would otherwise or damage him form the sheer force
of his Will or Fortitude. If the marine makes a successful Will or
Fortitude saving throw that would normally reduce the spell's effect, he
suffers no effect from the spell at all. Only those spells with a Saving
Throw entry of "Will partial", "Fortitude half", or similar entries can
be negated through this ability.

Mark T. Doolan
The Shattered Fractine
http://www.shatteredfractine.com