What are personnel who are not normally part of an explosives operation but need to be present called?

Personnel who are not normally part of an explosives operation but need to be present are referred to as "casuals." This term is used within the context of explosive operations to address individuals who may have a specific purpose for being in the area, such as observing or performing a task made necessary by specific circumstances.

Casuals do not have the same level of training or requirement to be involved in explosive operations and are typically present only for a limited time or for a specific event. This is important for maintaining safety protocols in environments where explosives are handled, as it ensures only trained personnel are actively involved in the operations while still allowing for necessary oversight or support from auxiliary personnel.

The other terms, while they may seem similar, do not specifically convey the necessary distinction within the context of explosive operations: "visitors" is too vague, "civilians" implies a broader category that may include individuals with relevant expertise or engagement, and "temporary staff" suggests a more formalized engagement in operational procedures not typically seen in relation to casual presence at explosive sites.