Aired on February 28, the 25th anniversary of the ATF raid that instigated the siege.
In addition to the Oklahoma City bombing in 1995, April 19 - the day of the Waco fire - is also the anniversary of another ATF/FBI operation, the four-day siege of a compound belonging to the far-right terrorist group The Covenant, the Sword, and the Arm of the Lord in 1985. Unlike Waco, the CSA raid was resolved peacefully, and the group disbanded shortly afterwards.
When David Thibodeau returns to the charred remains of the Mount Carmel compound at episode's end, the gold chain he finds is the drum key he gave to Michele Jones' daughter Serenity for her birthday in "Stalling for Time (2018)".