Following the U.S. Immigration and Customs Enforcement agency announcing it would end its contract with RIM and purchase $2.1 million worth of iPhones, Bloomberg reported today that the U.S. National Transportation Safety Board will also make the switch. The agency said in a notice posted to its website that BlackBerrys have been “failing both at inopportune times and at an unacceptable rate” while announcing plans to purchase iPhone 5’s as replacements:

While the agency only has about 400 employees, last month’s announcement from the U.S. Immigration and Customs agency means RIM will lose additional 17,600 government employees to the iPhone in the near future. According to the document posted by the Transportation Safety Board, the agency “requires effective, reliable and stable communication capabilities to carry out its primary investigative mission and to ensure employee safety in remote locations.” RIM, however, is still counting on many government customers to upgrade to BlackBerry 10…

As noted by Bloomberg, RIM Chief Executive Officer Thorsten Heins said last week that he still has high hopes for BlackBerry 10 in government, with a prediction that at least 400,000 government customers would make the upgrade.