Share This Article 1. On 15 May 1918 regular airmail service in the US was initiated by this government department. The US Navy The Federal Aviation Administration The US Army The US Postal Service 2. This battle is called the “Gettysburg of the Indian territory” The Second Battle of Cabin Creek The First Battle of Cabin Creek The Battle of Perryville The Battle of Honey Springs 3. For years it was a dictum at the US Army War College that no matter what the question, the answer was always this man. Napoleon Mahan Clausewitz Grant Loading …