Well, yes, but not any of these guys have much combat experience. He ordered the retreat because of the enemy artillery strikes, not the ground forces, but still.
Guys, you seem to love the Meltacannon, but that's not the Meltacannon, that's your allies' Missile Launcher, so if you want it, I suggest you either; a) talk to the Captain when you retreat inside or b) kill the allies with the Missile Launcher and take it from their cold, dead hands. The Melta is pretty damn effective as well, but against singular targets. It could take down even their biggest guys easily (but still, Short-Ranged, so I understand if you want to change for an autocannon or another type of MG, or that Missile Launcher)
Note: The Missile Launcher actually only took one Crawler out in this turn. They need to be in close packs if it's gonna be of any use.
Also, even though it's effect may look cool, it's actually Str. 6 and AP 6, so even if it can hit a lot of enemies, it's not very powerful. (It does have special ammo though, but that's against one target only) It even allows an Armor Save for the C's, even though a normal Lancer doesn't.
A normal Lancer is actually more powerful than this Heavy Weapon here. (No, of course it's not overpowered, how dare you?)