Research in Motion said the US Department of Defense (DoD) approved six models of the company's BlackBerry 7 smartphones for use on its networks.
The approval means RIM's single largest customer can upgrade to the Canadian smartphone maker's latest devices.
RIM's BlackBerry phones have long been used by army and other defense department personnel, but each new version of the device must be tested before it can be approved for use in sensitive roles where a data breach could endanger national security.
Last year, the US Army introduced new applications and capabilities, such as Near Field Communications and voice activated universal search, for its BlackBerry users, RIM said in a statement.
The BlackBerry -- criticised as outdated and outpaced in a field of touch-based devices -- is used by US President Barack Obama, who owns a modified and tightly-controlled model of the smartphone.
(Reporting by Abhiram Nandakumar in Bangalore; Editing by Viraj Nair)
Processing registration... Please wait.
This process can take up to a minute to complete.
A confirmation email has been sent to your email address - SUPPLIED GOES EMAIL HERE. Please click on the link in the email to verify your email address. You need to verify your email before you can start posting.
If you do not receive your confirmation email within the next few minutes, it may be because the email has been captured by a junk mail filter. Please ensure you add the domain @itnews.com.au to your white-listed senders.