Leadership is knowing about and caring for your troops. People are all different, and you need to learn their differences and work with them. Learn what motivates them, their strengths, and their weaknesses. People who work for you know whether you care about them based on how you treat them. Keep your Marines informed.
Communication ensures knowledge and both are key to a smooth functioning team.
If people don't know what's going on, they invent rumors to fill the communication void. Often those rumors hurt rather than help organizations. Stop the cancer of rumors by letting your troops know what's going on. Ensure the task is understood, supervised, and accomplished. Telling the troops to get something done does not ensure it ever will.