What is the function called that is used to swap crew members?

The function referred to for swapping crew members is called "Change crew." This term is commonly used in various operational contexts to indicate the process of replacing or exchanging crew personnel. It captures the essence of the action, which involves altering the current crew configuration by bringing in new members and removing others.

In operational settings, effective crew management is essential for ensuring that tasks are completed efficiently and that personnel are appropriately matched to their roles based on their skills, availability, and health conditions. The terminology "Change crew" succinctly encapsulates the specific action being performed and is widely recognized in industry practices.

The other terms may imply modifications or revisions to crew assignments, but they do not specifically denote the action of swapping out crew members, which is the critical action intended by the question.