Which training tool is an online collaboration resource for military training?

The Army Training Network (ATN) serves as an essential online collaboration resource specifically designed for military training. It offers a platform for soldiers and leaders to access various training resources, guidance, and best practices that are crucial for effective military operations. ATN promotes the sharing of knowledge and enhances communication between units, fostering a collaborative environment where personnel can improve their training and readiness.

This platform provides interactive tools, documentation, and forums where users can discuss training techniques and learn from one another. The emphasis on collaboration allows military organizations to stay updated with the latest training methods and regulations, ensuring consistency and high standards across the board.

While other options like EST 2000 and the Program Executive Office for Simulators relate to training tools and resources, they do not specifically embody the collaborative, online aspect that ATN provides. The Military Training Team, on the other hand, focuses more on delivering in-person training rather than creating an online collaborative resource. Hence, the ATN stands out as the correct answer due to its dedicated online infrastructure for collaboration and resource sharing within military training environments.