Which branch is NOT one of the categories that CPO falls under?

The category that is not included under CPO is Logistics. In the context of CPO, which typically stands for Chief Petty Officer in a military or naval environment, the primary branches include Seaman, Artificer, and Special.

Seaman generally refers to personnel involved in maritime operations, handling ship operations, navigation, and seamanship. Artificer usually pertains to those with technical skills in maintenance and repair roles, emphasizing a hands-on approach to equipment and machinery management. Special categories are typically designated for roles that require additional expertise or training beyond the standard categories.

Logistics, while crucial within military operations, does not specifically fall under the defined branches associated with CPO roles, as it tends to encompass broader support functions rather than the specific operational or technical focuses inherent to the other categories. Thus, the Logistics category is excluded from the list of categories that CPO falls under.