There are very benefits you will receive as a scientist and DRDO, ISRO and many other national level organization:

• Transport allowance
• Leave travel concession
• Medical facilities
• Promotion scheme according to merit
• Chance of getting higher education from recognised institution
• High pay salary in the starting
• Government residence will be provided
• Group insurance
• Canteen services subsidized

Read about DRDO recruitment:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/drdo-recruitment-through-gate/amp&ved=2ahUKEwibr_WAm9r2AhWOMN4KHZJLCisQFnoECAUQAQ&usg=AOvVaw13OJTo_9PzG9rozUqQw38w