Mondaloy: The Superalloy the Government Doesn't Want You to Know About

Mondaloy superalloy connects to AFRL, disappearances of Monica Reza and William McCasland

Ryan Callicoat April 4, 2026 • 6 min read min read

In the shadowy intersection of aerospace engineering and national security lies a material so specialized that public documentation barely acknowledges its existence. Mondaloy—a nickel-based superalloy developed in the mid-1990s—represents the cutting edge of burn-resistant metals capable of withstanding the inferno inside liquid rocket engines. Two of the people most intimately connected to its development have vanished. A third is dead. And the technology itself is now locked behind ITAR classification and a $4.7 billion corporate acquisition.

The Impossible Engineering Problem

To understand why Mondaloy matters, you need to understand the engineering nightmare it solved. Inside an oxygen-rich staged combustion (ORSC) rocket engine—the type Russia perfected and the United States spent decades trying to replicate—temperatures exceed 1,000°F while pure oxygen is pressurized above 4,000 psi. At those conditions, metals don’t just weaken. They ignite.

As SpaceNews reported in 2017, “The metals strong enough to hold that pressure were the metals that caught fire in the oxygen. The metals that didn’t catch fire were too weak to hold anything. Every alloy was a tradeoff that lost on one side or the other.”

Russia solved this problem decades ago with exotic nickel coatings on their RD-180 engine components. But the coatings were proprietary, the manufacturing was done in Russia, and the technical knowledge stayed behind Russian borders. The United States needed a fundamentally different solution.

What Is Mondaloy?

In the early 1990s, two metallurgists at Rockwell Science Center in California began working on a new class of nickel-based superalloys. Dallis Hardwick, an Australian-born materials scientist who had spent the Cold War studying metal combustion in high-pressure oxygen environments, partnered with her research assistant Monica Jacinto (later Monica Reza). They named their creation Mondaloy—a portmanteau of Monica and Dallis.

According to patent US20170082070A1, Mondaloy’s composition includes:

Nickel: 55–75% (base metal)
Cobalt: 12–17%
Chromium: 4–16%
Aluminum: 1–4%
Titanium: 1–4%

This specific formulation achieves what no previous alloy could: tensile strength of at least 145,000 pounds per square inch while self-extinguishing at oxygen partial pressures at or above 4,000 psi. In plain language: it’s strong enough to contain rocket engine pressures and it doesn’t catch fire in pure oxygen.

Two variants were developed. Mondaloy 100 for lower-stress components, and Mondaloy 200 for the most extreme environments inside the preburner and turbine assembly. As the Air Force confirmed, “Mondaloy 200™ alloy eliminates the need for exotic metal coatings currently used in the Russian-made RD-180 engine.”

The AFRL Connection and the AR1 Engine

In 1999, Hardwick and Jacinto entered their first cost-sharing program with the Air Force Research Laboratory (AFRL) at Wright-Patterson Air Force Base. During this period, Major General William Neil McCasland commanded AFRL’s Space Vehicles Directorate (2001–2004), overseeing the laboratory’s $2.2 billion science and technology program. AFRL’s Materials Directorate funded and qualified Mondaloy during 2011–2013, directly under McCasland’s chain of command.

The alloy found its primary application in the AR1 rocket engine—Aerojet Rocketdyne’s proposed American replacement for the Russian RD-180. According to Spaceflight Now, Mondaloy appeared in at least twelve critical AR1 components including the preburner, turbine rotor, turbine housing, ducts, lines, and hot gas manifold—essentially every part that would be exposed to hot gaseous oxygen.

In 2014, Aerojet Rocketdyne pitched the AR1 as “the only direct replacement for RD-180,” a 500,000-pound-thrust kerosene/LOX engine that would end America’s embarrassing dependence on Russian propulsion for launching national security satellites. The engine completed its Critical Design Review in May 2017. But by then, Blue Origin’s BE-4 had won the contract for ULA’s Vulcan rocket, and the AR1 program faded from public view.

The Russia Problem

The strategic significance of Mondaloy cannot be overstated. For over two decades, the United States launched its most sensitive military and intelligence satellites on rockets powered by Russian RD-180 engines—engines built by NPO Energomash, a company majority-owned by the Russian government.

When Russia annexed Crimea in 2014, Congress demanded an end to this dependency. When Russia invaded Ukraine in 2022, Roscosmos chief Dmitry Rogozin formally cut off engine supplies. The vulnerability Mondaloy was designed to eliminate had become an active national security crisis.

Today, Mondaloy is governed by ITAR—International Traffic in Arms Regulations—making its composition, processing parameters, and additive manufacturing procedures classified defense technology. Following L3Harris’s $4.7 billion acquisition of Aerojet Rocketdyne in July 2023, all Mondaloy intellectual property is now held by a single defense contractor.

Three People Who Knew Too Much

Dallis Hardwick (1956–2014)

The co-inventor of Mondaloy died in Dayton, Ohio on January 5, 2014. By then she had risen to lead all materials research for advanced gas turbine engines at AFRL, earning the Meritorious Civilian Service Medal in 2010. Her UNSW alumni profile describes her as “a pioneering metallurgist” whose “collaboration with research assistant Monica Jacinto resulted in the development of patented alloys… which remain essential to modern rocket technology.”

Monica Jacinto Reza (1964–?)

On June 22, 2025, Reza—then 60 years old, a former Technical Fellow at Aerojet Rocketdyne who had recently joined NASA’s Jet Propulsion Laboratory—vanished while hiking near Mount Waterman in the Angeles National Forest. She was last seen at 9:10 a.m. waving to a companion on the Upper West Ridge Trail.

An extensive search involving dozens of agencies, helicopters, K-9 units, and drones concluded its initial phase on June 30. She was declared dead after only four days—a timeline that investigators and journalists have noted violates standard missing persons protocols. The case was transferred to the Los Angeles County Sheriff’s Homicide Bureau: Missing Persons Unit. Despite ongoing efforts, no trace of Reza has been found.

William Neil McCasland (1957–?)

On February 27, 2026, retired Major General McCasland disappeared from his Albuquerque home. According to CNN, a repairman interacted with him at 10:00 a.m. His wife left at 11:10 a.m. for a medical appointment. When she returned at 12:04 p.m., he was gone.

The FBI became involved within days. Searchers recovered a light green long-sleeve shirt and hiking boots, but his wallet, a revolver with leather holster, and a red backpack remain unaccounted for. McCasland had reportedly been experiencing “mental fog”—a condition he cited when stepping down from advisory groups.

As former commander of AFRL and Wright-Patterson Air Force Base—a facility long rumored to house material connected to the 1947 Roswell incident—McCasland sat at the nexus of America’s most classified aerospace and materials research programs.

A Broader Pattern

Reza and McCasland are not isolated cases. According to reporting by American Greatness, The Daily Caller, and Newsweek, nine top-level scientists in the United States have died or vanished within the past year. Seven had connections to AFRL or institutions it directly funds:

Anthony Chavez, former Los Alamos National Laboratory worker, missing since May 4, 2025
Monica Reza, Mondaloy co-inventor, missing since June 22, 2025
Melissa Casias, missing since June 26, 2025, Taos County, New Mexico
Nuno Loureiro, MIT nuclear science and fusion researcher, died of gunshot wounds in December 2025, age 47
William McCasland, former AFRL commander, missing since February 27, 2026
Carl Grillmair, Caltech astrophysicist, killed at gunpoint February 16, 2026, age 67
Jason Thomas, Novartis pharmaceutical researcher, found dead in a lake March 17, 2026, three months after disappearing

A sitting congressman has called for FBI assistance in investigating the pattern. Law enforcement maintains the cases are unrelated.

The Custody Chain Is Broken

Consider the current state of Mondaloy’s knowledge chain:

Dallis Hardwick, co-inventor: dead (2014)
Monica Reza, co-inventor: missing (2025)
William McCasland, AFRL commander who oversaw its qualification: missing (2026)
Aerojet Rocketdyne, the company that manufactured it: acquired by L3Harris (2023)
AR1 program, its primary application: cancelled
ITAR classification: ensures no public scrutiny of the technology or its disposition

Every person who held deep technical knowledge of this superalloy is now dead, missing, or behind a corporate firewall. The alloy that was supposed to free America from Russian rocket dependency is now controlled by a single defense contractor with no public accountability for its development or deployment.

Whether this is coincidence, institutional negligence, or something darker—the questions deserve answers that no one in authority seems willing to provide.