Army AI
Chug,
Both the Army and the Navy have Cranfield trained AI teams, being trained on the same course as the AAIB. The RN teams are at RNFSAIC and the Army team is AIEFSO. Furthermore, the Army have Standing SI(BoI) Presidents that are AI trained and thus not the "gifted amateurs" that preside over RAF and Navy SIs.
If it ain't broke, don't fix it!