UPDATE:
You can download the Android Team Awareness Kit (ATAK) – Civilian (CIV) through the TAK Product Center at TAKMaps.com.*
![This image has an empty alt attribute; its file name is takmaps-page.png](https://i1.wp.com/www.civtak.org/wp-content/uploads/2020/07/takmaps-page.png?fit=735%2C362&ssl=1)
Original Article:
You can download ATAK-Civ 3.6.1 from here. You can use ATAK to download and use the imagery from Evr2est.US, here, either ask JP2000 GeoTiffs, or with a bit more work as WMS feeds.
Evr2est.us is a Government-run web site which allows emergency responders to access current imagery. Its integrated with ATAK.