The AFF Universe Wiki also has an article on this topic: Antarean Star Empire

"Fight well for your Emperor!"

The Antarean Imperial Army (AIA) and the Antarean Imperial Space Navy (AISN) are the two Antarean military branches commanded in AFF. Lore wise, they are more technologically advanced, disciplined, and fast/agile than the ULP's military, although their manpower and resources run thin.

The AIA make use of a yellow-red colour scheme.

Their exclusive sidearms are the Avex EVP pistol, and the Salier P4 SMG.

For main weapons, they use:

Of course, all neutral sidearms and main weapons are available too.

As for ground vehicles:

The following space fighters are in use by the AISN:

And they also use these capital ships:

And finally, the Cricket Dropship.