He'd still end up squished as Stalin directs more and more forces as necessary to put an end to this "Capitalist/Fascist plot". Shepard may be good, but his armour is useless, shields gone, and maybe a handful of rounds left for his Carnifex. Even if he's a Vanguard, he's not going to be punchsploding tanks because at any decent engagement range, the T-34s will simply lob HE shells at him. If you want to drop him into the WWII time zone, I have three possible variations. 1: Dropped into the western front as the Allied invasion has begun to advance. His scorched and battered body found by British infantry in the ruins of a bombed out city who can't make sense of the remnants of his kit. Even as torched as it is, it's clearly far more advanced than the standard uniforms they have. Thinking him to be part of Germany's increasingly desperate attempts at Wunderwaffens (supersoldiers), they debate whether to shoot him or drag him back for interrogation. Unfortunately for them, Shepard wakes up as the shoot faction gains a bit more momentum. End result? Biotic explosion. 2: A variation of 1, except it's on the Eastern front, and he's found by Werhmacht troops as they're falling back from the Soviet advance after a particularly heavy artillery shelling. Default Shep looks a bit Aryanish, so thinking him to be one of them, an elite possibly with his advanced looking gear, they pull him back with them. 3: The troll option. Shepard lands in Nagasaki, August 9, 1945. If he's lucky, in one of the POW coal mining camps.