The card says to move a space per piece removed towards Active Opposition. Reading this literally, if four pieces were removed, one could adjust one space by four levels (e.g. Saigon). Is this the intent of this card, or is it meant to imply that each space so adjusted can only be adjusted by one level?
From the playbook:
Wind down seen: Remove 1-4 US pieces from map to Available.
For each piece, Patronage +2, shift a space 1 level toward Active
Opposition, and place 4 NVA Troops outside the South. Stay Eligible.
Tips. The Faction executing the Event decides the details. “Pieces”
can include Bases. A Province with 0 Population cannot shift (1.6).
“Outside the South” means any North Vietnam, Laos, or Cambodia
Provinces. The Faction executing the Event stays Eligible for the