The DOD has not released any cost information. One calculation put the cost at $3.4 million, but that may be low. A rough estimate would be higher, $6 million, calculated as follows: If there are 1,000 visitors (400 senior officers and 600 support personnel), and each costs $4,000 for air travel, ground transportation, and lodging, then the total travel cost would be $4 million. Extra base costs for overtime, food, and security might be another $2 million, bringing the total to $6 million. That does not include opportunity costs for diverting DOD assets from other activities.