SiNtx Technologies Inc (SINT)

[SmokerX]

singling out rare earth metals and critical energetic materials for munitions and missiles as areas of concern.

I dont think that's how silicon nitride works. I think you just need sand, coke and natural gas to catalyze nitrogen from the atmosphere. Now the rare earth metals used in the catalyzing of nitrogen from the atmosphere Im not sure about. That might come in to play since nitrates are important in production of explosives and thus probably rocket fuel. But im not sure about what elements are used here since Im not focused on it.

in keeping with the theory that a nuclear-powered missile like the Burevestnik caused the explosion.

https://www.newsweek.com/russia-reactor-nuclear-arkhangelsk-roshydromet-nyonoksa-1456275

The success of this project would depend upon a series of technological advances in metallurgy and materials science. Pneumatic motors necessary to control the reactor in flight had to operate while red-hot and in the presence of intense radiation. The need to maintain supersonic speed at low altitude and in all kinds of weather meant that the reactor, code-named "Tory", had to survive high temperatures and conditions that would melt the metals used in most jet and rocket engines. Ceramic fuel elements would have to be used; the contract to manufacture the 500,000 pencil-sized elements was given to the Coors Porcelain Company

https://en.m.wikipedia.org/wiki/Project_Pluto

A nuclear thermal propulsion rocket engine would use a small nuclear reactor to generate heat from uranium fuel. That thermal energy would then be transferred to a liquid propellant, probably liquid hydrogen, which expands into a gas and is shot out through a nozzle to produce thrust. "So you get the exhaust moving very fast out the back end," Sheehy says.

https://www.popularmechanics.com/space/moon-mars/a18345717/nasa-ntp-nuclear-engines-mars/

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rare earth metals:

Yttrium- This one is important for doping ceramics.

Small amounts of yttrium (0.1 to 0.2%) have been used to reduce the grain sizes of chromium, molybdenum, titanium, and zirconium.[70] Yttrium is used to increase the strength of aluminium and magnesium alloys.[6] The addition of yttrium to alloys generally improves workability, adds resistance to high-temperature recrystallization, and significantly enhances resistance to high-temperature oxidation

Gadolinium-

in shielding of nuclear reactors. It is used as a secondary, emergency shut-down measure in some nuclear reactors, particularly of the CANDU reactor type.[3] Gadolinium is also used in nuclear marine propulsion systems as a burnable poison.

Lanthanum-

Hydrogen sponge alloys can contain lanthanum. These alloys are capable of storing up to 400 times their own volume of hydrogen gas in a reversible adsorption process

Praseodymium-

As an alloying agent with magnesium to create high-strength metals that are used in aircraft engines; yttrium and neodymium are also viable substitutes.[38][39]

Thorium-

In the 21st century, thorium's potential for reducing nuclear proliferation and its waste characteristics led to renewed interest in the thorium fuel cycle

Uranium- self explanatory
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Between dopants for alloys, catalyzing agents, cryocoolers and potential for magnets and batteries for solar powered small craft I think im just tapping on the tip of this iceberg. In all out war consuming our reserves of rare earth elements vs. China's I think we'll all be dead before we have an issue with supply.

In economic warfare it might be of strategic importance. Economic warfare could be like a cold war laying a siege before developing an advantage over your enemy to either cause him to surrender, become obvious they cannot present a threat against you or become easy enough to wage a hot war against them.