The Government Accountability Office (GAO), through processes of review requested by Congress, produced several reports on the need for foreign language skills and cultural capital in various departments of government, including the Department of Homeland Security (DHS), Department of Defense (DoD), and Department of State (DoS). You can view the most recent GAO reports related to foreign language at the links below:

2009 Report on the Need for Language Skills in the DoD

2010 Report on the Need for Language Skills in the DHS

2010 Report on the Need for Language Skills in the DHS, DoD, and DoS

2015 Report on the Need for Human Capital in OPM & Other Agencies