Final answer:
It is true that J1 tracks the efforts of Service components regarding personnel activities and issues within a military joint force, focusing on personnel management and administration.
Step-by-step explanation:
The statement that the joint force J1 tracks the efforts of the Service components to stay abreast of personnel activities and issues that could affect the joint force is true. The J1 designation typically refers to the personnel or human resources section of a joint staff within a military command structure. They are responsible for monitoring, managing, and directing all matters of personnel and administration for the joint force. This includes keeping track of staffing assignments, morale, personnel readiness, and other administrative elements that might impact the operational capability and effectiveness of the force.