Yes, through the GI Bill.
Yes. The amount of pay depends on their rank and how long they have been in.
probably about 100-200
A marine corps scout snipers pay is determined by his rank and years in service.
The US Marine Corps pay scale is the same as all of the services. It is based on the rank and the time in service for the member. Other factors include being married and special pay for jobs like flight pay and jump pay. It starts at $1357 while in boot camp.
O3 in the Army, Marine Corps, and Air Force; O6 is the Navy and Coast Guard (a Navy and Coast Guard Captain is equivalent to an Army/Marine Corps/Air Force Colonel).
If you're asking what the name of that pay grade is, there are only two and they are Sargent Major (there's also the SgtMaj of the Marine Corps, but there's only one of them) and Master Gunnery Sargent.
2247.30 per month, base pay
Your unemployment will be calculated on your base pay.
Sergeant Major is E9 which is the highest NCO "pay grade" in the marines. Command Sergeant Major is E9 as well but has more seniority than just a Sergeant Major. Sergeant Major of the Marine Corps is also E9 but has the most seniority of any NCO in the marines. E9 means that you are enlisted and you are rank 9. E9 is used to represent the pay grade.
The pay grade of a Master Sergeant is $46,256 - $65,974 (based on experience).
It depends on their rank and how long they have been in. http://www.defenselink.mil/militarypay/pay/bp/01_activeduty.html
It is the pay grade of E-6, and they range from Old Salts to the Best and the Brightest of the Modern Marine Corps.