No there is not relaxation for army personnel. However there are two types of reservation provided to the students on different basis. I am mentioning below these two different basis of reservation:

• Schedule caste and Scheduled tribe candidates are offered 15 seats as reservation.
• National cadet Corps candidates having c certificate are offered 25 seats as reservation.

If the reserved seats are not filled by reserved category candidates then seats will be filled only by general category candidates.

Click on mention below link for getting more details about military nursing services examination:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://medicine.careers360.com/articles/indian-army-bsc-nursing/amp&ved=2ahUKEwiitLilvKH1AhVbsVYBHYKOAywQFnoECAwQAQ&usg=AOvVaw1qrVOlbr9ngyWpSYXUhS1_

You can also get details about how to prepare for military nursing Service Examination by clicking on mentioned below link:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://medicine.careers360.com/articles/how-prepare-for-mns-exam/amp&ved=2ahUKEwiitLilvKH1AhVbsVYBHYKOAywQFnoECAkQAQ&usg=AOvVaw0cfDBMM6LMbvxPqJBxFCB-