Some of the service members say they were not told why they were being discharged. Others who pressed for answers said the Army informed them they'd been labeled as security risks because they have relatives abroad or because the Defense Department had not completed background checks on them.
Spokespeople for the Pentagon and the Army said that, due to the pending litigation, they were unable to explain the discharges or respond to questions about whether there have been policy changes in any of the military branches.
Eligible recruits are required to have legal status in the U.S., such as a student visa, before enlisting. More than 5,000 immigrants were recruited into the program in 2016, and an estimated 10,000 are currently serving. Most go the Army, but some also go to the other military branches.