Can't get over how derpy the flags wave in Field Intensity so I swapped them with a better model (both of these shipped by gearbox, funnily enough!), then edit the textures and adjust the bones a bit in HLAM and adjust the entities in the map with bspguy. I've uploaded this edit on ModDB as an addon. Link in comments.
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Uploaded on ModDB: moddb.com/games/half-life/addons… The download might take a day to authenticate.