Due to special request and after the success of Mk 1, Project Genesis realized it could be repurposed two seated training/ rescue operations. Thus the Excalibur Mk2 was born. It features many perks the Mk1 had including its famous STOL (Short Take Off and Landing) abilities only slightly heaver due to it being a two seater. Download at spaceport here. http://kerbalspaceprogram.com/project-genesis-excalibur-mk2-all-stock-3/