I'll agree with shinobichan with the Spartans being well at adapting in combat enviroments, looking at the Cheif crashing on Halo Alpha (or whatever the first Halo planet was called) then dealing with posessed soldiers and the Flood... first time I faced one of the posessed Marines, I just shot him and figured I was too trigger happy for my own good.
Remember the breeze across your face
Remember the swaying sleeves in the wind
Remember the grains of sand beneath your feet
between your toes
Remember the freedom in the never ending waves
Remember I'll be at the beach.
Jedi Academy - Renaissance