Samsung Electronics said five of its Galaxy-branded smartphones and tablets that come with its enterprise security software recently received approval from the U.S. Defense Information Systems Agency, allowing them to be listed as an option for officials.

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The five devices are: the Galaxy S4, Galaxy S4 Active, Galaxy Note 3 smartphone, and two tablet models from the company’s popular Galaxy Note lineup. (The list doesn’t include Samsung’s latest Galaxy S5 smartphone)

Knox allows users to have a virtual “container” within their smartphone that come with customized contents and apps for enterprise clients. Samsung claims that documents and files stored within the container are more secure from breach, while users can freely switch back and forth from mobile applications used for work and personal use.

The announcement comes as Samsung continues to seek security certifications from government agencies worldwide for its Knox-installed devices, as a part of its push into the global enterprise market. The company believes that winning certifications from defense ministries will help persuade corporate clients to switch to Samsung phones. The move hasn’t been easy as Samsung tries to address the needs of the world’s most security-conscious network managers.