I came across a Reddit post where the OP was concerned whether doing an internship at BARC, ISRO or DRDO would cause him/her to be ineligible for US visa. OP stated that a friend of his/her uncle who worked for a year or two at DRDO was denied visa because of his job history. Another commenter anecdoted that a friend who had done a project for ISRO was denied visa because she mentioned it in her interview.
Is there any rule which denies visa to students who had done internship in the above mentioned organizations? Are such students and ex-employees of the above organizations automatically ineligible for US visa or citizenship?