Could YOU Become an ULTRAMARINE? (Warhammer 40,000)

Explain It Simply

Could you actually become an Ultramarine, one of the deadliest Space Marines in Warhammer 40,000? You start as a mortal boy surviving the Aspirant Trials on Macragge, endure the gene-seed implantation of nineteen new organs and the hypno-conditioning that rewrites your mind, then fight the Tyranid