Final answer:
The 'tool' to approach a distressed soldier refers to metaphorical strategies and psychological support, not a physical device like a metal detector.
Step-by-step explanation:
When discussing the approach to a distressed soldier, the tool in question is metaphorical rather than physical. The context suggests strategies and mental tools from military strategy and psychology that can help manage difficult situations. Referring to figures and principles outlined in military manuals or strategic texts, such as the importance of treating soldiers with humanity, but maintaining iron discipline, or the concept that soldiers in desperate straits can show incredible resilience and courage.
The approach might involve creating a sense of camaraderie, ensuring that the soldier doesn't feel isolated or hopeless (in line with quotes from Sun Tzu), and encouraging them to focus on the mission and their fellow soldiers. Implementing a balance of support and discipline can also be important, as this can help maintain unit cohesion and effectiveness under stress.