Which of the following is NOT a component of the CASE acronym?

The correct answer is "Sustain," as it is not a component of the CASE acronym. The CASE acronym stands for Cover, Assess, Suppress, and Evaluate. Each of these components represents actions that infantry soldiers should take in combat situations to manage engagements effectively.

"Cover" refers to the idea of finding or creating protection from enemy fire. "Assess" involves evaluating the situation, including understanding the enemy's position and capabilities. "Suppress" represents the action of using fire to inhibit the enemy’s ability to return fire or maneuver. However, "Sustain" does not fit into this framework; it typically relates to maintaining an operation over time rather than the immediate tactical actions represented by the other components of the CASE acronym.