I'm confused; I thought you were going for a Navy SEAL.
And yes, that's the most standard real world contractor story, really.
Those big league PMCs are usually recruiting from former special operators and law enforcement officers.
There are other special operations units to choose from, especially the US has a whole slew of them, such as:
JSOC has the
Combat Applications Group, better known by their common name
Delta Force (Tier 1 versatile operators), although they are never refered to as such by people associated with the program. They perform all sorts of tasks, such as intelligence, counter-terrorism, direct action, hostage rescue, tactical intervention, etc.
The Navy's counter part of Delta Force is known as
DEVGRU (also known by their former, now unofficial name,
ST-6), their activities are largely unspoken of by officials, and as such nut jobs usually theorize they perform black operations. They, with Delta Force, are the US's primary counter-terrorism units.
The Army has the
75th Ranger Regiment (a member of this regiment is informally known as a 'ranger'. The regiment as a whole is also sometimes refered to as the
Rangers). They are not part of JSOC because their use is not "specialized" (well, not usually anyway. Although, exceptions occur), they're merely the US Army's "big guns."
The Marine Corps have their most famous SOC unit,
FORECON, or
Force Recon as they are popularly known, whom perform most of the tasks previously mentioned, with a focus on intelligence gathering, scouting, and amphibious ops.
The US Navy has the oh so hyped up
Sea, Air and Land Teams, commonly (and surprisingly often officially) known as the
Navy SEALs. The name comes from their capability to operate in virtually all environments. Despite this however, most of their operations take place on land. All members of the SEALs are male, no exceptions.
Those are the most prominent SOC units of the US armed forces! Why do I know so much about USSOCOM? Oh, Yuki, you so crazy.
