So you're Freeman, huh? The Vort said you were on the way. You gotta outsmart 'em. If they can get a beat on your rocket, they'll shoot it down. Why don't you come with me and I'll show you how to shoot down these Gunships? 

This steerable Rocket launcher is our best bet for taking down a Gunship. Ah, hello! I'll be right with you! Now, where was I? Ah, yes... Using the laser guide, you can steer your rocket past the Gunship's defenses and prevent it from shooting down your rocket. This will only anger it at first, but if you can survive long enough to make several direct hits, you'll be rewarded with a prize worthy of any mantlepiece. Now, who's going to be the lucky one to carry it into combat? Ah, yes! Gordon Freeman! I couldn't have asked for a finer volunteer!

Colonel Odessa Cubbage at your service! Damn! Let me just send a warning to Lighthouse Point, then I'll come right up to lend a hand! Go on! Teach that Gunship a lesson it will never forget! Remember: use the launcher's laser guide to steer your rocket past the Gunship's defenses.