The Armstrong-type was a type of starship used by Starfleet in the mid-23rd century in the alternate reality.

A typical ship of this type had two outboard nacelles and an inboard nacelle. These nacelles were connected by swept pylons to the underside of the primary hull. Similar to the Miranda-class starship in the regular reality, an Armstrong-type starship was equipped with a rollbar supporting a multi-tube torpedo launcher. Extending from the trailing edge of the primary hull, and connected to the rollbar by smaller pylons, there was a structure housing the impulse drive. This type participated in the pivotal Battle of Vulcan in 2258, and was named after the USS Armstrong. (Star Trek)