That isn't sabotage, that is simply product design. Anthropic is free to create their products that refuse to kill people, and the DoD is free not to buy those products if they don't fit their needs.

However, that's not what a supply chain risk is. It's not an order to "don't buy these products if they don't work the way we want them to", its designating Anthropic as a national security threat because they might intentionally sabotage US military operations.