Final answer:
The NCO should salute the flag once it is hoisted clear of their grasp during a flag raising ceremony, aligning with military protocol and respect for the national symbol.
Step-by-step explanation:
During a flag raising ceremony, when the flag is hoisted clear of the grip of the senior member of the detail, the correct action for the non-commissioned officer (NCO) is to salute the flag. This is a sign of respect and military protocol when the national anthem or "To the Colors" is being played and the flag is being raised. The senior member holding the flag ensures it does not touch the ground, a practice that underscores the reverence held for the national symbol. The act of saluting aligns with the tradition and rules that govern how members of the military demonstrate respect to the flag.