I like it, I was going to suggest Pocket Sand that dispersed when intense heat was applied or triggered a sensor (it was going to be recombinated materials, not just sand). Going to make a couple more proposals for diversity though.
Sonic Shield Emitter:
The Sonic Shield Emitter is a device that creates a barrier of molecular interference by using sound waves to shake up and scramble the atoms in a targeted area. When worn on a device the size of a watch it can project a barrier the size of a buckler, with larger sized Emitters capable of creating larger barriers and even bubbles. While solid projectiles are more likely to penetrate the barrier, warheads and light-based weaponry are susceptible to premature detonation and diffusion when encountering a Sonic Shield.
"Gemini" SMML-63 MANPAD:
The "Gemini" is a shoulder-mounted man-portable air defense weapon. The Gemini has two tubes that fire 1.5m long missiles individually. The missiles fired from a Gemini are designed with sensors meant specifically to detect and home in on signatures emitted by the Merethian "Blizzard" aircraft. Each missile also has a toothy smile painted on the warhead.
Temporal Agents:
Something always felt off about interacting with the Astral Realm, almost like you were flipped upside-down. It's because the Astral Realm somehow manages to both influence and be influenced by ours, but everything we know is wrong here. There. It gets confusing now for everyone involved. But here is what we do know.
We can ever so slightly manipulate time.
It's why our interactions with it have resulted in precognitive abilities. By taking the best of the best, our S.E.E.M. commandos, and training them in the manipulation of reality, they can manifest themselves at points near specific targets, such as an enemy officer in the midst of ordering a charge, or a soldier about to sneak into and clear a room, for a brief moment, which is enough to kill someone, before disappearing from that point in time. As they are technically in two points of time at once for that brief moment, we cycle our S.E.E.M. commandos out in shifts, where they are sent into the Astral for as long as they need to before launching a single attack and then immediately removing themselves from the Astral Realm to prevent whatever kind of damage consistent exposure to that kind of stress to themselves. Or, you know, the Universe, which is why the agents only ever interact with the Present.
I want time traveling Nightcrawler-like assassins damn it.