Overwatch. Most of the vehicles are old, but many of the ground troops are new or updated.
Admiral Blackdog, supreme commander of the Blue Sector's military forces, has been missing in action since his ship was disabled over New York.
After dying in battle against Rainbow Crash during Operation Haymaker, Sir Jeremiah Gottwald was rebuilt as a cyborg powered by Orange Transparent. His strength and reflexes have been massively increased, allowing him to cut through hordes of infantry and heavy armored vehicles with his OT Nova Sword.
Jeremiah pilots the Siegfried, a one-of-a-kind war machine built to interface directly with his cyborg body, drawing power from his OT energy source and taking commands directly from his mind. Equipped with a Cavorite Float System and armed with a heavy energy cannon, missile launchers, and a pair of massive drill missiles, the Siegfried can annihilate entire squadrons of conventional fighters and mecha on its own.
Though skilled in many different forms of warfare, Captain Harris prefers to lead the Royal Dragoons, the Blue Sector's elite cavalry unit. Their laser lances can fire long-range energy beams or project a deadly energy blade, and the riders are trained to call down heavy artillery on the few targets they can't deal with themselves.
Her Majesty's Infantry form the core of the Blue Sector's ground forces. Officers carry banners to inspire them to stand firm in the face of oncoming fire.
The Royal Artillery Corps provide the infantry with fire support from their heavy field cannons and steam gatlings. The gunners wear heavy armor and carry axes in case their positions are overrun.
The Special Astro Service, better known as "those sneaky bastards" by the rest of the infantry, serve the Empire as long-range scouts and snipers.
Royal Marines are the Empire's elite ground forces. Their rifles are longer ranged and more powerful than those of the regular infantry, while their shields protect them from return fire. Their squads are accompanied by gunners with a wide variety of heavy weapons.
An Officer and Marine grunt.
The mighty Steam Gatling is one of the most dreaded weapons in the Britannian arsenal, able to pump out a constant stream of rapid fire. This model is one of the most compact, featuring a backpack-mounted boiler.
Recently developed by the Royal Society, the Enervated Phlogiston Projector can destroy heavy infantry and light vehicles at long range.
Land Sailors crew the landships of Her Majesty's Land Navy.
Valiant-class land frigates are the most numerous ships in the Land Navy, and are used mainly to transport and support infantry formations.
More advanced Challenger-class land cruisers carry heavy steam gatlings and rocket torpedoes to engage enemy armor and air support.
Finally, the mighty Conqueror-class land battleships flatten the enemies of Britannia with massive artillery barrages.
The Meteor is a new lightweight interceptor, armed with six small-caliber machine guns to tear apart enemy fighters at close range.
The Mosquito is a heavy fighter armed with quad guns, a heavy underslung cannon, and multiple hardpoints for missiles. It's usually used to strafe and bomb ground targets in support of infantry and landships.
I like how this last shot makes it look like it should be flying backwards.