It is a subtle change. In the past, a patrol was expected to move in stealth. The goal was to find the enemy and then decide whether to engage. That started to disappear in Vietnam. Today, patrols do not focus on stealth. They move in the open. Often the goal of a patrol is to be seen. First contact isn't 'finding' but being fired upon by the enemy. Being ambushed isn't considered a failure. It is the plan, the primary means of identifying an enemy position. Under that mentality, every soldier becomes a tank.