It could also be for the purpose of learning. The Army and Marines have different approaches in many aspects. Marines can learn from the Army's experiences. For example, the Army might have some innovative tactics in dealing with large - scale logistical challenges. Marines can study these through the stories and apply relevant knowledge to their own operations. So, telling these stories helps in cross - training in a way.
One horror story could be about a Marine unit getting lost in a desolate and haunted area during a training exercise. They start hearing strange noises at night, like whispers that seem to come from nowhere. Some of the Marines swear they see shadowy figures moving between the trees, which really freaks them out.
The creation of the US Marines was a response to the evolving military requirements of the United States. It involved strategic planning, recruitment of skilled individuals, and the development of training programs to mold them into a capable fighting force.
One idea could be to focus on the origin stories of the marines in the fanfic universe. Maybe explore how they were recruited and what their initial training was like.
There was a marine who was very good at physical training but had a fear of heights. During a rope climbing drill, he climbed up slowly, muttering to himself all the way. When he reached the top, instead of coming down the rope in the normal way, he just froze there. His buddies had to coax him down for a long time. It was really funny seeing this tough marine turn into a scared cat on that rope.