Conversation so far:
When did Jo Stafford sign with Capital records?
She subsequently became the first solo artist signed to Capitol after leaving the Pied Pipers in 1944.
What was the USO?
Stafford's tenure with the United Service Organizations (USO) during World War II--which often saw her perform for soldiers stationed in the U.S.
What role did she play?
Stafford was a favorite of many servicemen during both World War II and the Korean War; her recordings received extensive airplay on the American Forces radio.
Did she travel over seas?
CANNOTANSWER.

Question: Why was the USO important to her?
Self-contained rewrite: Why was the United Service Organization (USO) important to Jo Stafford?