Laugh maniacally like every good villain should.

They send a senior commander with only two goons? So what, does Number 5 take on the Chinese while Fenrir takes on America?

First things first, we need recruits. Invasions are messy. Messy messy messy. Some poor shmucks have to have had their crops mashed by some of those fancy tanks that the Chinese and Americans love so much. Also, the criminal undergrounds are likely fuming at the occupation.

Criminals are too self serving and cowardly to use as troops, but they could definitely give us a nice black market with which to arm our recruits. And by recruits, I mean angry mobs that will cause enough of a disturbance to give the three of us an opportunity to sneak in and get the damn anthrax sample, or at least destroy the facility that it's stored in.

I suggest sending Fenrir and Number 5 out to stir up the rabble. "These imperial pigs come into our land, saying that they want to free us, save us, help us. Enslave us more likely. What have they done for you besides destroy what you have?" And so on. Hopefully the people are too angry to think this through.

We, in the meantime, should start meeting with the various criminal cartels to cut them a deal. Hopefully we can protect ourselves... but if we're a wussy non-fighting leader type, we should probably bring Number 5 with us, at the expense of slowing the initial rabble rousing.

...

We need more dudes.

Well there's another GLA commander around doing the fighting , and our mission is to

1) raise hell
2) find anthrax

so two dudes should be enough! I say we raise hell by ambushing an american supply convoy or something.