Game(s) Country Service Type Nickname Motto Subordinate unit of Subordinate units Engagements Notable Members The 7th Cavalry Regiment is a United States Army cavalry regiment, whose lineage traces back to the mid-19th century. Its official nickname is "Garryowen," in honor of the Irish air Garryowen that was adopted as its march tune. The 7th Cavalry appears in Battlefield Vietnam, during the Battle of Ia Drang and Ambush at LZ Albany.