OT could use a addition like adding more casing, able to mix flames in fuel tank (casing), fire properties like napalm being hard to extinguish.
More Casing
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M74 (AGM) casing: It have two parts: 1. cartridge case(fuel) and 2. the payload. just like the other AGM it could only be use in a launcher. It only uses 2 Vial (a bottle) as the container is small. stats are just like M40
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Cluster Shell casing: It have three parts: 1. small warhead(payload) 2. the warhead 3. the shell(fuel). The small warhead can only fit a bottle and needs a separate igniter-igniter. the warhead can fit 1-4 small warhead. The stats are almost the same as custom shell.
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CAS missile casing: It have three parts: 1. The Warhead 2. Payload 3. The Missile(fuel). The Payload must be inserted into the Warhead and can contain 6 bottles(why not). The warhead must have the Igniter-Igniter. The Missile must have 120u of Ammonium Nitrate.
Fire More properties
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Napalm is harder to extinguish. (not affected to duration)
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Ethanol/Methane is almost invisible but still emit light. (just imagine the ff to these)
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Thermite can damage structures like walls and doors