Update (7 October): I mistook the date of publication. The article is just now available.
This morning’s (3 October 2014) Politico Morning Defense asked just that question:
CAN DoD TEACH EVERY OFFICER A FOREIGN LANGUAGE? No answer yet on that one—the Pentagon is late delivering a report to Congress on what it would take to teach every uniformed officer a foreign language. The report is now expected by the end of April. The reason for the congressionally mandated study's tardiness is unclear, but a letter sent to the Senate Armed Services Committee describes the issue as "complex.”
I doubt that complex is the right word. As I argue in a forthcoming a new article in Small Wars and Insurgencies (February 2015, vol. 25, no. 5/6), if military organizations want to take transnational counterinsurgency seriously, they really need to speak the local language of the countries in which they’re intervening. Teaching Pashto or Arabic or other challenging languages to those raised in English (or something yet more easily mastered) isn’t easy, but it is possible, and on a large scale. Every Australian officer graduating from the Royal Military College at Duntroon is expected to attain proficiency in an East or South Asian language by graduation. Why this cannot be required at the academies in the United States is not obvious to me.
For more, wait until February 2015, and then read “'Outside their Expertise': the Implications of Field Manual 3-24 for the Professional Military Education of Non-Commissioned Officers"