Hi Sean,
Great news! At ArcGIS Pro 2.6, the tools were included in ArcGIS Pro so there is no need to separately install Military Tools for ArcGIS since you have ArcGIS Pro 2.8. Let me help you locate them.
The Military Symbology Editor is there, but needs to be added to the ArcGIS Pro ribbon. See Military Symbology Editor documentation.
The other capabilities that you may have read about in the Military Tools documentation are also in ArcGIS Pro. Here are links to the ArcGIS Pro documentation that provide information on where you can find the tools and topics on using them:
Coordinate Conversion
Distance and Direction
Visibility Analysis
Defense Tools toolbox
Thanks,
Lorraine