Hope you are doing well rankumgudu!

Yes you can apply for SSC CGL even if you are an army Agni Veer ex serviceman. But you must fullfill the eligibility criteria given below:

• You must have a bachelor's degree from University that is recognised.
• You must be between 18 to 32 years of age ( although you maybe granted relaxation incase you are from a reserved category)
• You must be a citizen of India ( this may also have relaxation for a subject of Nepal, Bhutan and for a person who has migrated to India from countries like Pakistan, Sri Lanka, burma,etc but is of Indian origin.

Some post may have specific bachelors criteria so you will have to check that specifically as for your post requirements. You can check more detailed eligibility criteria and decide if it fits for you specifically or not from the link given below:

https://competition.careers360.com/articles/ssc-cgl-eligibility-criteria