What type of contract support typically involves US citizens, third country nationals, and local national contractors?

The correct answer is external support, as it encompasses the utilization of contractors who may come from various backgrounds, including US citizens, third country nationals, and local nationals. This type of support is essential in operational environments where the integration of diverse contractor backgrounds can enhance mission effectiveness and operational flexibility.

External support typically refers to the resources and services provided from outside the immediate military structure. This can include a variety of logistical and operational support that leverages the expertise and capabilities of contractors, which may be particularly valuable in complex environments where local knowledge and experience can play a critical role. The participation of different nationalities allows for a wider range of skills and insights, adapting to local conditions and needs efficiently.

The other options do not fully capture the broad geographical and operational inclusion that external support entails. Internal support usually refers to resources and personnel that are part of the military structure itself, which does not include the diverse contractor elements. Logistical support mainly focuses on the supply chain and movement of resources within military operations, while technical support is oriented toward specific technological assistance rather than the broader involvement of varied contractor nationalities.