# Stack Formation A **stack formation** (or "tactical stack") is a close-file military and law enforcement movement technique used for building entry and room clearing. Personnel move in single file, each person's hand on the shoulder or back of the person in front, maintaining physical contact to communicate direction changes, halts, and speed in environments where verbal communication is impractical or dangerous. The lead person navigates; the rest follow by touch. The formation allows a team to move through doorways, corridors, and staircases as a cohesive unit rather than as individuals. The formation is standard training in infantry, SWAT, and law enforcement tactical units. It became nationally significant on January 6 when **[[Oath Keepers]] members entered the U.S. Capitol in a textbook stack formation** — single file, hand on shoulder, moving in tactical cadence through the Rotunda — and the footage was captured on security cameras and bystander video. The images became the most visually striking evidence that trained military personnel were conducting an organized paramilitary operation inside the Capitol, not participating in a spontaneous protest. ## The January 6 Stack The Oath Keepers entered the Capitol in **two separate stacks**: **Stack One** entered through the East Rotunda doors at approximately 2:40 p.m. — a group of approximately 8–10 members in full tactical gear, moving in classic stack formation through crowds of rioters who were moving as individuals. The contrast was visually unmistakable: a disciplined military formation moving through chaos. **Stack Two** entered through the same doors shortly after, following the same formation protocol. The stacks were coordinated by [[Stewart Rhodes]] from outside the Capitol via encrypted Signal communications. Rhodes did not enter the building himself — he directed from a position outside, consistent with a command role rather than an operational one. ## Why It Matters The stack formation served three evidentiary functions in the seditious conspiracy prosecution: **1. Premeditation.** You don't execute a stack formation spontaneously. It requires training, practice, and pre-coordination — who leads, who follows, what the hand signals mean, how the team transitions through doorways. The Oath Keepers' use of stack formation inside the Capitol was evidence that they had trained together, planned their entry, and were executing a rehearsed tactical movement. **2. Military identity.** The formation identified the Oath Keepers as a distinct operational unit within the larger mob. Rioters moved as individuals or in loose groups; the Oath Keepers moved as a military team. This visual distinction supported the prosecution's argument that the Oath Keepers were not protesters who got swept up in events but a paramilitary unit executing a planned operation. **3. The doctrine-to-insurrection pipeline.** Like the [[Quick Reaction Force (QRF)]], the stack formation demonstrates the transfer of professional military and law enforcement training into extremist paramilitary operations. The Oath Keepers who executed the stack had learned the technique in the U.S. military or in law enforcement tactical training. They applied it to breach the U.S. Capitol. ## See Also - [[Quick Reaction Force (QRF)]] — The companion doctrine-to-insurrection concept; the weapons staging that supported the stack - [[Oath Keepers]] — The organization that executed the formation - [[Stewart Rhodes]] — The commander who directed the stacks from outside - [[January 6 Capitol Attack]] — The event itself - [[Militias and Extremist Groups Ecosystem]] — The broader movement context