Hello Visual. 

MARCOS is a special force that is maintained by Indian navy to handle emergency situations arising from various means.

The selection is done at the early age of soldiers, i.e. in the 20s of fresh soldiers to maintain the strength and josh in the force. Well, as per the criteria, the aspirants get a chance to get inducted in the Indian navy through NDA, CDS, SSC etc. and also through direct recruitment for lower posts. The required basic physical strength is high and so is the training process. So aspirants to get into this organization, you need to first become a part of the Indian navy. The selection process consists of two parts. First one is three days long where a soldier’s physical stamina is accessed. The next phase of screening is tougher and then makes the final selection of soldiers for further training. The screening or selection phase rejects more than half applicants on the basis of their physical stamina required for the force.

You can apply a maximum of two times for the Marcos ops. 

Thank You.