While there isn't a single perfect synonym, the following terms capture some of the key aspects of Vietnamization:
* Gradual withdrawal: This highlights the phased nature of the US troop reduction.
* Training and equipping: This emphasizes the focus on strengthening the South Vietnamese military.
* Self-reliance: This underscores the goal of enabling the South Vietnamese to defend themselves.
* Peace with honor: This was the Nixon administration's stated goal, though many argue it was not achieved.
You could also use phrases like:
* The Nixon Doctrine: This policy called for the US to provide military and economic support to allies but not to commit American troops in large numbers.
* De-escalation: This reflects the attempt to reduce US involvement in the war.
The best synonym depends on the context and what specific aspect of the Vietnamization program you want to emphasize.