This Student Handbook is intended to serve as a reference for students
attending the TRADOC G2 ACE Opposing Force (OPFOR) Threat Tactics
Course. It is not intended to be comprehensive or prescriptive.
The focus is helping students apply a doctrinal hybrid OPFOR threat,
based on best practices representing conventional forces, irregular
elements, and criminal organizations, with a range of capabilities –
analogous to actual worldwide adversaries.

https://g2webcontent.z2.web.core.usgovcloudapi.net/OEE/Threat%20Tactics%20Course/TTC-Student-Handbook-1-2-202001.pdf