Soldier 76 is Jack Morrison. After the death of Overwatch, Morrison was presumed dead when in reality he was in hiding. He raided multiple corporations that had profited from the downfall of Overwatch, and stole their tech, including his tactical visor and the Heavy Pulse Rifle he wields. However, I'm curious about the origins of his new name, Soldier 76. Is this just an arbitrary number he is given? Or does the number 76 have more significance?
The most accurate guess to this is because:
Before long, he earned a coveted position in the government's controversial and still-classified (but widely acknowledged) "soldier enhancement program." Source
He is assumed to be the 76th Soldier to be accepted into this program.
His origin story is highly classified and there is no definitive proof as to what 76 means, but this is the closest answer in my opinion.
If you go into a custom game with multiple Soldier 76s, their number values will increase. It may be a hint from blizzard that he is a clone. (Or just an easter egg)
His name's obviously a reference to USA's founding year 1776. The character had been conceptualized and named by Metzen long before Overwatch existed.
The 76 in Soldier 76 may refer to his combat mission kills. This may be like Zarya's 512 tattoo (that's how many kilograms she can lift, her world record). Once more, his story is classified, so no one knows for sure.
It could be just a random number to hide his identity and because he's already obviously into being american, judging by his default red, white and blue clothes, he could've chosen that number because of 1776.
I disagree. If you've adopted a new identity, to throw people off of your trail, why would you use such an obvious reference?
I think Soldier is one of many clones of Morrison. The 76th, in fact. This jives with the "easter egg" of numerically sequential Soldiers in 'bot matches.