NPR:
The plan under consideration is laid out in a memo from Pentagon officials to Defense Secretary James Mattis. In the memo, obtained by NPR, high-level personnel and intelligence officials cite security concerns and inadequate vetting of recruits under a program called Military Accessions Vital to the National Interest, or MAVNI.
The memo also cites "the potential threat posed by individuals who may have a higher risk of connections to Foreign Intelligence Services," and it refers to an "elevated" risk of an insider threat.
The recruitment program began in 2009 to attract immigrants with medical or language skills, such as surgeons or Arabic speakers. It allows visa holders, asylees and refugees to bypass the green card process to become U.S. citizens.
The founder of the MAVNI program, retired Lt. Col. Margaret Stock, said the security concerns are overblown. "If you were a bad guy who wanted to infiltrate the Army, you wouldn't risk the many levels of vetting required in this program," she said.
http://www.npr.org/2017/07/03/535342867/pentagon-considers-canceling-program-that-recruits-immigrant-soldiers
Not actually 100% sure about that last. But those who didn't want this should have voted all-out for our Democratic candidates.
I'm sorry this is happening to these people, but fwiw, let's remember that the Army has no duty to induct civilians to protect them from deportation or to provide them with education. Uncertainties surrounding some of these people's legal ability to serve in future should the loose flywheel in the WH strike also have to be a real, genuine concern.
Btw, that entire WaPo article was published in Stars and Stripes, suggesting a great deal of agreement. No surprise there either.