No they do not! This is a common misconception. I have trained many Lt's who have never commanded a rifle platoon before getting the a PMOS of 0203-Ground Intelligence Officer
I have also trained a good many Capt's who wanted make this an FMOS (a secondary MOS) who never served in an Infantry unit.
Here are the requirements for a 0203 MOS:
1) Must be eligible for a top secret clearance based on a Single Scope Background Investigation (SSBI) .
2) Must be a male lieutenant to be assigned this MOS as a primary MOS . This MOS may be assigned as an additional MOS to male captains and above .
3) Complete the Infantry Officer Course (IOC), MCCDC, Quantico, VA; the Scout Sniper Platoon Commander's Course (SSPCC), MCCDC, Quantico, VA; and the Ground Intelligence Officer's Course (GIOC), Navy Marine Corps Intelligence Training Center (NMITC), Dam Neck, VA .
http://www.tbs.usmc.mil/All_MOS.asp