DRDO is a premier research organization in India. So no need to worry, so just add the training details in your resume and apply for job

There are so many company in which you can apply to get the job, they will give preference as you have done training from DRDO so if you have done any project from DRDO then also give it to resume.

You may also try to get job in DRDO also. If you applied in some MNC's then they will give first preference to you. So this will be an advantage for you to get good jobs in future.