Utterly Mad

Wolf:
"Noone can ever predict what this planet can bring you..."
He gets up, and walks over to the window, currently showing Vita's 2 moons shining in the star-clad sky.
"Whether it's good or bad."
He stands there for a moment, as if thinking about something. Then he returns to his chair.

"But I'm not here to discuss philosophy corporal. I'm here to discuss your unit."
He pulls out a folder with 3 documents. Every document has it's own image of an armored walker.
"I've been provided an array of vehicles to carry out the missions I hand to you. But I'm lacking capable crews."

-He pulls out a document, and puts it in front of you. It bears the picture of a walker of the same model you've been using today.
"When you arrived, they assigned you to the standard walker. Nothing special, pretty well-rounded."
He then puts up the other 2 next to the first.

-The second image is that of a light walker. It's bipedal, with a little bit longer legs, smaller hull, and in turn a smaller turret. There's no turret on the belly, but there are machinegun mounts on it.
"This is a lighter walker. It's faster, and more agile. But in turn, it's less armored, and less armed. Just a 75mm gun on it. But it does have machinegun mounts, making it capable of taking on both infantry and any possible air assets."

-The third image is that of a heavy walker. It's a quadrapedal tank, with a large, sloped hull. The legs look sturdy and strong. The turret is larger than the standard, and is armed with 2 90mm cannons on one picture, and a quad 20mm AA gun on a separate image.
"This is a heavier walker. It's a bit slower, but it's well armored, and well armed. It's like a small ship on land. It can both carry a fear-inducing quad 20, or a dual 90mm."

"So to summarize, I'm giving you and your crew the opportunity to switch over to another walker. You crew is qualified, and they're the optimal amount of crewmen.
Or you could stick to you current walker. The choice is yours corporal. Either way, I get a qualified walker to utilize."

Smasher:
((I assume you mean the AA gun, and not the organic, humanoid hounds.))
You take a careful look at the AA gun. It looks like a KAA-23. Four 23mm guns, forward-facing plates, and exposed ammunition at the turret base.
Hitting there with either an explosive or high-caliber bullet ought to send them flying.

Your squad manage to deal with the flankers, leaving only the AA-gun and the various hounds in front of you as threats.