Doubt. The US suffered around 60k deaths in Vietnam before it pulled out, yet it has proven a willingness to withstand at least 5x more losses than that. WWII cost the US around 300k deaths, its civil war cost around 200k deaths.

I think they just didn't want to commit more american lives to whatever objectives it is that they had. They definitely had and still have the capability to do so, but they chose not to.