Frederic,
Name appears to have been US Special Reception Center.
I think you can find an example of the process on
http://www.381st.org/History/WarDiar...nuary1945.aspx
where Sgt Lavalle came down behind enemy lines (14-1-45), could evade, was hospitalized and returned to base on the 29th.
Because he had been an evader and been in possible contact with the enemy he was ordered to London for interregotion next day already (30-1-45).
To avoid any risk that he could compromise anyone who might have helped him during his evasion in the unlucky case he was taken prisoner on a next occasion, he was sent Stateside on 26 feb 45.
Regards,
Leendert