Final answer:
Horizontal cohesion in Marine units is developed through shared experiences during unit training and exercises, including living in close quarters and overcoming hardships as a group. This process builds group identity and solidarity crucial for the military effectiveness of the unit.
Step-by-step explanation:
Unit training and exercises are often the best ways to develop horizontal cohesion. The shared experiences, close living quarters, and shared hardships during unit exercises often bring Marine units together. This process is a fundamental aspect of military training where individuals learn to operate as a cohesive unit. The activities, which include keeping areas clean for inspection, learning to march in precise formations, and saluting superiors, are designed to build group identity and solidarity among military personnel. The concept of 'group cohesion' or 'solidarity' is crucial for the military success of any unit, including Military units.
In this context, the shared experiences might include a variety of challenging scenarios that are specifically created to foster unit cohesion. Overcoming these obstacles as a group leads to a stronger bond between the members of the unit. Examples of shared experiences might be collaborative exercises where soldiers undergo physically demanding training or scenarios that test their collective problem-solving abilities. This approach echoes historical practices, such as the British army's 'pals' units during World War I, where men who signed up together fought together, which boosted morale but also had tragic consequences in battles like the Somme.