The United States Department of Defense on Friday approved the use of Apple devices running iOS 6 on its networks, Bloomberg reported. The iPhone will compete with BlackBerry 10 and Samsung KNOX devices, which received approval earlier this month. The Pentagon has continued to test alternative platforms to give employees flexibility when choosing a work phone. The DoD even has plans to create a mobile app store that can handle as many as 8 million devices. There are currently more than 600,000 mobile devices in use at the agency, 470,000 of which are older BlackBerry smartphones. There are currently more than 40,000 iPhones and 8,700 Android devices in use, however most of them aren’t connected to military networks except for testing purposes.