When can Commanders or Soldiers deviate from lawful orders?

The correct choice emphasizes that Commanders or Soldiers can deviate from lawful orders only when those orders are unlawful, pose needless risk to lives, or do not fit the situation at hand. This principle is grounded in military law and ethics. Legal and safe conduct is paramount in military operations; therefore, any order that violates the law or endangers personnel without just cause must be reconsidered. This ensures that Soldiers maintain their responsibility to uphold both legal standards and the welfare of their troops.

This understanding is critical in military operations, where following orders is essential, but not at the expense of legality or safety. If an order is determined to be unreasonable or dangerous under the current circumstances, it is the duty of the individual to question and potentially refuse to follow it as part of their ethical and legal obligations.

The other options do not accurately reflect the serious nature of decision-making in a military context. The idea of "tactical flexibility" or "improvisation" doesn't justify violating orders without consideration of legality or safety. Likewise, morale, while important, does not create a legitimate reason to deviate from lawful orders unless those orders themselves compromise the troops' safety or legal standing.