Board Thread:Warhammer 40k General Discussion/@comment-5846164-20130527133906/@comment-8881468-20130625225619

all space marines that are not serving in scout squads/as wolf scouts  wear one of the different marks of power armour.

as you can read in the corresponding article, power armour augments the user's strenth with servos and electric fibres that work like muscles. they also have minor medical options as far as I know, dispensing narcotics, stims and the likes into the bloodflow of the organism, however they don't offer another heart/pump for your blood.