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Guided .50 cal bullets

V40, those US thermobarics I remember now would have been full scale aircraft bombs and there is also a submunition named BLU-73/B but I do not know when it got adopted.

Those napalm bombs had WP initiators, I am not sure if this will work with FAEs at all.

As said my knowledge is very limited and the little I know is mostly on Soviet and eastern stuff.
 
The BLU-72's were a FAE device -a fuel tank ruptured by an explosion, then the fuel cloud detonated by small "cloud detonator" charges (about 30 grams of H.E.).
Thermobaric charges are single-event weapons (no cloud forms that is then detonated by a second charge). Thermobaric explosives are usually fuel (aluminum powder) rich explosive mixtures that have a weak peak pressure, but a longer pressure-over-time strength (which is more dangerous to people, and buildings).
Using White phosphorous in a FAE device would not work- an actual detonation is needed to get the cloud of fuel to detonate, too. Otherwise- all you would get is a fireball, and no real increase in pressure.
 
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