Final answer:
The name of the missile could not be determined without additional context. ATG might refer to Anti-Tank Guided Missile, while Mk. 1 could be a first version designation, and 'Uncommon' suggests rarity rather than a name.
Step-by-step explanation:
The question you've asked does not provide enough context to identify the specific missile you are referring to. There are many different missiles with various designations, including Anti-Taank Guided Missile (ATGM), which could be abbreviated as ATG Missile. Mk. 1 (Mark 1) could refer to the first version of a particular weapon system. 'Uncommon' is not typically a designation for a missile, but it could indicate that the missile in question is rare or not well-known. To provide an accurate answer, we would need more context or details about the missile you are inquiring about.