The CSO [Chief Software Officer, U.S. Air Force] signed a Memorandum [...] regarding the use of #DevSecOps and #Agile and highly discouraging from using rigid, prescriptive frameworks such as the Scaled Agile Framework (#SAFe).

https://software.af.mil/wp-content/uploads/2019/12/DSOP-AMA-v1.0.pptx