Bienvenido Alejandra! [@Xandrya]

In the military community, the number six or zero six refers to the commander. Zero seven is the Sergeant Major or Senior NCO (Non-commissioned officer) and zero five is the Executive Officer (XO). In a Company, the number one, two and three are reserved for the Platoon leaders. At battalion and Brigade, the numbers one, two, three and four refer to the four primary staff officers; S1-Personnel, S2-Intelligence, S3-Operations and S4-Supply & Logistics.

Sorry everyone. Sometimes I get carried away. Spent too many years in combat boots and I still wear my dog tags.