Can't We call the early Atlas a SSTO?

The booster package did drop off. Is this a stage event, or is it just
getting rid of extra/spent mass? This may sound like a dumb question,
but I would like to know what others think. Maybe the old Convair
Folks had a better path for a future booster family? I know that the
top tank strength was always a sticking point.

Carl

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