David Beckham has insisted that three Manchester United legends perfectly embodied a core part of the Red Devils’ identity during the Sir Alex Ferguson era. One of the famed members of the ‘Class of ‘92,’ the 49-year-old former Manchester United superstar enjoyed a prolific playing career at Old Trafford. David Beckham, who retired from football in 2013, catapulted to superstardom during his time under legendary former United manager Sir Alex Ferguson. The United legend was a key part of Ferguson’s legendary teams of the past and was a devastating attacking threat for the Red Devils out on the…