Civilian vessels in riverine military roles

Could river-cruise vessels be converted for military use?

A cruise ship might move personnel or support casualties behind the front, but it has almost no frontline survivability.

A civilian conversion begins with the role the ship can safely perform. A river-cruise vessel could move personnel through a secure rear area or provide extra space for casualty care. Its construction and layout offer almost no resilience once an enemy identifies and attacks it. Such a ship can support transport or medicine under controlled conditions, but it would be a poor frontline combatant.