Which trait applies to both system and non-system training aids?

The trait that applies to both system and non-system training aids is that they are procured by the Program Executive Office for Simulation, Training, and Instrumentation (PEO-STRI). This reflects the formalized and structured approach taken within military training environments to ensure that all training aids, whether categorized as system or non-system, meet specific requirements and standards established by PEO-STRI. This centralization of procurement helps maintain consistency in quality and functionality across various training programs.

In contrast, privately developed training aids by contractors may vary in quality and availability, and not all such aids are procured through PEO-STRI. Open-source and freely available aids do not necessarily align with military specifications or training objectives since they lack the oversight from a central authority like PEO-STRI. Additionally, stating that training aids are only required for initial military training does not account for their ongoing use throughout various stages of military training and readiness, making it limited in scope. Thus, the accurate answer reflects the structured procurement process that supports both systems and non-systems in training contexts.