Using a US DOD CAC on Android
Arg, the military and their acronyms. Anyway yes there are some companies that are TAA compliant (Trade Agreements Act [19 U.S.C. &amp; 2501-2581]) 

Thursby with PKard is one that is known to have a working model for both CAC or PIV (Personal Identity Verification) cards.
Reference

Samsung Knox also has a working system and they do have DOD contracts. I believe they are TAA compliant because they are from a friendly foreign country. At what clearance level though I am unsure about because of the foreign country thing. Reference