US rocket scientist vanishes without trace as secret military patent emerges

The disappearance of a rocket scientist has taken a chilling new turn after it emerged she held a one-of-a-kind patent tied to advanced US launch systems, according to a report by the Daily Mail.

Monica Jacinto Reza, 60, was last seen hiking in the rugged San Gabriel Wilderness area in the Angeles Forest on June 22 last year at about 9:10 a.m. local time before vanishing without a trace.

The circumstances surrounding her disappearance have puzzled investigators. According to reports cited by the Daily Mail, a man walking roughly 30 feet ahead of Reza on the trail toward the Waterman Mountain summit turned back moments later only to find she had disappeared.

Reza was carrying a backpack believed to contain several liters of water at the time, adding to the mystery of how she could vanish so suddenly in broad daylight.

Attention has now shifted to her professional work, with public records revealing her role in developing advanced aerospace materials used in high-performance propulsion systems. She is listed as the only surviving co-creator of a 2010 patent for a specialized metal designed to withstand extreme heat while resisting ignition — a rare combination critical for rocket engines.

The alloy, known as Mondaloy, was later used in key components of advanced propulsion systems, including the AR1 rocket engine developed as part of US efforts to reduce reliance on foreign technology.

Reza spent decades working at Rocketdyne, later part of Aerojet Rocketdyne, a major aerospace contractor involved in government-backed propulsion programmes. Her work was supported by the US Air Force Research Laboratory, placing her at the center of sensitive national security-linked research.

Her case is not isolated. The report noted that several scientists with ties to aerospace, defense or nuclear research have died or disappeared in recent years, drawing public attention but with no confirmed links between the incidents.

Among them is retired US Major General William Neil McCasland, who also went missing in 2025 under unexplained circumstances, along with other researchers connected to high-level scientific work.

Authorities have not confirmed foul play in Reza’s disappearance, and the investigation remains ongoing. But the combination of her sudden vanishing and her connection to advanced US rocket technology has added a new layer of intrigue to a case that continues to raise more questions than answers.

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