Which type of engagement is specifically mentioned as incompatible with the 'ENGAGE' directive?

The 'ENGAGE' directive is specifically designed to ensure operational clarity and avoid unintended consequences on the battlefield. In this context, Type I Close Air Support (CAS) engagement involves direct control from ground forces, which requires detailed coordination and precise targeting due to the close proximity of friendly forces. This type of engagement necessitates a specific set of criteria, including the need for the ground controller to visually acquire the target, making immediate engagement directives a potential risk.

In contrast, the other types of CAS engagements—such as Type II and Type III—allow for different levels of control and coordination, which can typically accommodate broader rules of engagement with enough safeguards to mitigate risks. Type IV CAS, though less commonly discussed, also tends to have less stringent requirements compared to Type I. Consequently, the specificity of the 'ENGAGE' directive is incompatible with Type I CAS because it can lead to confusion or unintended strikes if not precisely controlled.