The USS Leo (NCC-607) was a Federation Hermes-class (mk VIIa Monoceros-subclass) class I scout starship in service to Starfleet in the mid-to-late 23rd century. The Leo was authorized for construction by Starfleet appropriation on stardate 3669 (mid-2260s). (TOS reference: Star Fleet Technical Manual)
Galloway served aboard the Leo at some point prior to his assignment to the USS Enterprise in the mid-2270s. (TOS - Star Trek II Short Stories short story: "Intelligence Test")
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| Hermes-class class I scout starships | ||
|---|---|---|
| Hermes-class | Aeolus • Anubis • Batidor • Bowie • Bridger • Calypso • Carson • Cody • Cochise • Crockett • Diana • Hermes • Quintillus • Revere • Sacajawea • Spaker • Tonti |  
|
| Monoceros-subclass | Aries • Camelopardus • Canis Major • Canis Minor • Equulus • Leo • Leo Minor • Lepus • Lupus • Lynx • Monoceros • Pegasus • Taurus • Ursa Major • Ursa Minor • Vulpecula | |
| Cygnus-subclass | Apus • Aquila • Columbia • Corvus • Cygnus • Grus • Pavo • Phoenix • Tucana | |
| Hermes-class (Kelvin timeline) |
Aeolus • Hermes |  
|
