The Commander of XCOM (you) had been captured within the first few months into the campaign of the war in 2015: having been in stasis for 20 years, the tutorial will guide you through with Bradford himself pulling you out of an ADVENT facility. Do note that tutorial makes The Untouchables achievement unattainable. It's recommended to play through your first time with it on, since it also contains plot exposition that you otherwise miss. There is no way to change the events, and you will always finish the mission with two casualties, and one soldier ( Jane Kelly) on your roster at Squaddie rank with the Ranger class.
The tutorial mission is entirely scripted, designed to introduce you to various concepts.
