Quoted: I thought they retired the Atlas booster last year?
If so, you've got one hella' wait to see one.
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Nope, your thinking of the Titan IV, which was replaced by LockMarts EELV entrant, the Atlas V which is in my opinion the lesser booster between it and Boeing entrant, the Delta IV, which uses a throughly modern cryogenic engine the RS-68 where as the Atlas uses a Russian produced RD-180 which uses RP-1.
That being said the Atlas provides a cheaper booster that in a triple barrled heavy configuration would lift significantly more then the Delta IV heavy.
The Atlas family of EELVs
The entire Delta lineage, the Delta II was the first launcher comercially developed for space lift
It is note worthy that both the Delta and Atlas can use the GEM 60 solid rocket motors to provide additional payload.