No, you're fair.
In regard to the definition of success, we have watched missions have evolving definitions of success. In Libya, for example, it was an R2P, which seemed to migrate to regime change, arguably. Then years ago in Afghanistan, it was to eliminate bin Laden, and it migrated to something else, then something else, then something else again. It puts a tremendous strain on the military to achieve success.
When the government tasks the military to do something, how is the definition of success negotiated so that it's within your capabilities and is reasonable?