Months later...dam dam daaammm HALO 3 2553 3.3 the war ended but before that you got halo ce halo 2 and halo 3 their close together (time like blabla)
Sure it wasn't 2525? That would make much more sense.
yes it does make sense halo:reach is the Spartan program, Master Chief is part of the Spartan 2 project which started a year or so after the first program
it is set in late 2552 to early 2553