I assume if you really want this data for military purposes, you have enough budget to do something beyond free Google maps output. There are many commercial providers who are already taking pictures of the globe.

> I assume if you really want this data for military purposes

Typically we are using NGA 1m DTED for the terrain elevation data but I don't recall off the top of my head who usually supplies the imagery layers. We'll pull multiple map types from a WMS Server, including raster maps like FAA VFR mapsheets for our Area of Operations.

https://en.wikipedia.org/wiki/DTED

https://en.wikipedia.org/wiki/Web_Map_Service

https://www.beautifulpublicdata.com/faa-aviation-maps/