Despite its increasing sophistication, learning analytics still lacks field-tested high-fidelity indicators of how eLearning content specifically can improve readiness. Distance learning has served as a functional supplement to traditional on-site exercise pre-training (Ljung, 2018), but its early applications demonstrated only that eLearning can be operationally integrated into an exercise. Seeking validated measures of eLearning’s impact on mission rehearsal readiness, the National Defense University of Ukraine (NDUU) utilized Experience Application Programming Interface (xAPI) instrumented content in two planned computer-aided exercises in 2020. Data from the “NATO Standards” exercise showed an 8.4% performance deficit by the control group, which received only traditional physical pre-training materials, compared to the eLearning pre-trained treatment group. The control group fared even worse in the "Joint Headquarters" exercise, showing a 20.45% performance deficit in team performance compared to that of the treatment groups which received a diversified package of both eLearning course content and a microlearning on-demand eBook for pre-training.