The Alexander-MkI was the first starship designed and built to function for Star Command.
They are named for famous people in history, the class is named for Alexander The Great.
The single engined, utilitarian design made it an instant smash hit amongst the Star Command officers. Its classic design was considered instantly iconic and was so successful that it remained in service long past the expected lifespan of the design.
Even once the larger Alexander-MkII Class was produced, and proved equally successful the Mk-I remained in service and proved to be a continued success, its versatilse space frame proving to be so adaptable that new technologies could be incorporated easily.
Even in the beginning of the 300'sAE they a few MkI's are still in service such as the ScSS Boshell.
The standard crew compliment is 175 crew.