The fact that Pasadena and Irvine had nearly identical warning notices (helicopters, explosions, simulated gunfire, same evening) suggests they may have been coordinated elements of a larger Southern California training event rather than isolated drills. That said, no public military statement currently identifies the unit or explains whether the sites were linked

Confirmed #1 — Pasadena

At the former St. Luke Medical Center

Helicopters
Simulated gunfire
Controlled explosions
Publicly announced by the City of Pasadena
Supported by local news coverage and city notices.

Confirmed #2 — Irvine

Separate public notice from local authorities.
Similar warnings about military activity, explosions, and simulated gunfire.
Same night as Pasadena.

Possible #3 — Long Beach

I have not found a reliable source tonight confirming a separate urban-training exercise in East Long Beach matching the Pasadena activity.

Pasadena

Started around 8:30 p.m.
Continued until approximately 12:30–1:00 a.m.
Included helicopters, simulated gunfire, and controlled explosions.

Irvine

Public notices for the Irvine-area military training indicated evening/night operations with similar warnings about explosions and weapons-fire simulation occurring during the same general nighttime window.

Long Beach area

Reports described military helicopters and training activity occurring in the Long Beach region during the same night. However, public reporting has been less specific about exact start/end times and whether it was a standalone exercise or part of a larger coordinated operation.

This has been #UndergroundWarReport for 06/04/2026

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