The following is the September 2021 Government Accountability Office report, Satellite Communications: DOD Should Explore Options to Meet User Needs for
Narrowband Capabilities.
From the report
Why GAO Did This Study
DOD has invested $7.4 billion to develop, build, and begin delivering MUOS. However, longstanding gaps between the fielding of the satellite system and compatible user terminals have limited DOD’s ability to fully use the system.
The Senate Armed Services Committee report to the bill...
https://news.usni.org/2021/09/06/gao-report-on-defense-department-satellite-communications