Input (grade 13): Depending on the nation, military branch, mission, and organization, a modern combat regiment resembles a brigade, in that both range in size from a few hundred to 5,000 soldiers (3 to 7 standard battalions).
Output (grade 12): A modern regiment can also be similar to a brigade, in that both can be from a few hundred soldiers to 5,000 soldiers (from 3 to 7 battalions).