Final answer:
Leadership in keeping marines informed can be developed by maintaining open communication, establishing effective signs and signals, leaving contact information, promoting ecological awareness, and encouraging civic engagement.
Step-by-step explanation:
You can develop the leadership principle of keeping marines informed by ensuring that communication lines are always open, providing timely and accurate updates about missions, strategies, and any changes that may affect them. This involves creating effective signals and signs for coordination, as well as maintaining a practice of leaving your contact information so individuals can reach out for clarification or further information. Additionally, promoting ecological awareness and involving marines in civic engagement practices can contribute to a well-informed and proactively thinking unit.