The Process for Engagement (PFE S/I) command is not used with which threat types?

• A. TBM or ASM
• B. UAS
• C. A2G Missiles
• D. Ballistic Missile (BM)

Answer: (C)

PFE is the command that coordinates how Patriot engages airborne threats that travel through the defended airspace, deciding which track to engage, which interceptor to launch, and how the firing solution is prepared for those targets. It is used for threats that Patriot is designed to defend against in flight—things like ballistic missiles in flight, anti-ship missiles, or unmanned aerial systems—because these threats move through the air and fall under the system’s engagement procedures.

Air-to-ground missiles, launched from aircraft toward ground targets, do not fall under the same engagement sequencing managed by PFE S/I. They are missiles of a different category that require other procedures outside this process. Since the question asks which threat type does not use PFE S/I, air-to-ground missiles are the best fit. The remaining threat types—tactical ballistic missiles or anti-ship missiles, UAS, and ballistic missiles—are all scenarios where PFE would be involved in directing engagements.