What is the definition of a disease and nonbattle injury (DNBI)?

The definition of a disease and nonbattle injury (DNBI) encompasses any casualty that is lost to an organization due to issues that are not related to combat situations. This includes individuals who may have been affected by an illness or those who have sustained injuries while engaged in non-combat activities. The term is crucial in military settings as it highlights the impact of health concerns and injuries that arise outside of battle scenarios, which can significantly affect operational readiness.

Focusing on the other options, they either pertain solely to combat-related injuries or do not fully address the broader scope of health-related issues or injuries that lead to a loss of personnel. Thus, the correct choice accurately reflects the comprehensive nature of DNBI, encompassing all non-combat-related casualties.