Maybe securities should be able to enter hunters to fight against the hydra's or you can exclude the hydra's all together and only allow the somewhat slower sea-sparrows (no explosions) and/or tanks (which can't fly)? Also what YoMama said, securities can also use the rocket launchers against terrors on ground, but I don't see a problem here because hydra's can also be used for both air assaults and ground attacks. It's your own decision how you use your weapon. In short, the idea of security able to acquire a rocketlauncher doesn't sound that bad to me. However, I think that 1 or 2 rockets are not enough to stop a hydra especially when they (hydra's) are able to avoid them very easily when flying full speed. They are only effective on stationary hydra's.