The question...

[jmm99]

I am not about to explain the difference. I will state where I am coming from (which ultimately goes back to the War Crimes thread where I had to read in order to understand, since most Gitmo detainees resulted from special operations, military and/or civilian).

My knowledge of SOCOM is based on looking at its legal framework, which is summarized in the Operational Law Handbook 2008 (chap. 24, Special Operations - all quotes below from that source); and by reading other, related materials.

From a lawyer's standpoint, SOCOM is very legal intensive: (1) as to the Laws of War and Rule of Law, and development of ROEs, because it is on the cutting edge of operational considerations involving them; and (2) as to the "Laws of Appropriations" (turf and rice bowls), which affect everything:

A. As noted above, 10 U.S.C. §167 established USSOCOM. This Combatant Command is unique in that it is the only Combatant Command specifically established by Congress and required by law. The DoD could, for example, eliminate the Pacific Command (PACOM) and reorganize its sub-component units. However, DoD does not have the authority to disband USSOCOM. Congress realized that, if it created a Combatant Command without a separate funding authority, DoD would continue to have tremendous control and the ability to drawdown SOF assets simply by refusing to fund their programs. Therefore, an entirely new budgetary authority, Major Force Program Eleven (MFP-11), was established to fund SO. Some have observed that USSOCOM is the only Combatant Command with its own "checkbook." This is important for SO because MFP-11 funds may only be used for articles and programs with an SO basis or nexus.

B. USSOCOM is both a supporting and supported command. It is a supporting command in that it is responsible for providing ready and trained SOF personnel to the geographic Combatant Commanders. It is a supported command in that, when directed by the President or Secretary of Defense (SECDEF), it must be capable of conducting selected strategic SO under its own command.

All of the following is well-known to everybody in this discussion - so, this is not intended to be educational, but solely a framework for discussion (which comes at it from a legal viewpoint):

D. Each service has its own specific SO command. For the Army, it is the U.S. Army Special Operations Command (USASOC), commanded by a Lieutenant General, at Fort Bragg, NC. The Naval Special Warfare Command (NAVSPECWARCOM) is commanded by a Rear Admiral at Coronado, CA. The U.S. Air Force Special Operations Command (AFSOC) is located at Hurlburt Field, FL and led by a Lieutenant General. These service specific SO commands are responsible for selecting, training, and equipping the force. They are also responsible for SO doctrine within their respective services. In the Army, USASOC is a Army Service Component Command (formerly MACOM) and, therefore, Army SOF (ARSOF) is not within the FORSCOM chain of command.

E. There is also a Joint Special Operations Command (JSOC), a sub-unified command of USSOCOM, which is located at Fort Bragg, NC. This is a joint command that studies special operations requirements and techniques; ensures interoperability and equipment standardization; plans and conducts joint special operations exercises and training; and develops joint SO tactics.
[JMM: plus more].

F. In 2006, the U.S. Marine Corps Forces Special Operations Command (MARSOC) was established at Camp Lejeune, NC under the command of a Major General. Other than MARSOC, certain units of the Marine Corps, along with particular conventional elements of the U.S. Navy and U.S. Air Force, have been designated "special operations-capable." SO-capable units are, from time to time, designated as SOF units by SECDEF for specific operations. Many Marine Corps units perform and train to perform SO-type missions. The expeditionary nature of the Marine Corps makes it particularly well-suited as an SO-capable force.

The discussion re: the difference between SOF and SF (I think) focuses on USASOC and ARSOF and their components (quoting just the headings):

G. U.S. Army Special Operations Forces (ARSOF) includes active duty, Army National Guard (ARNG) and U.S. Army Reserve elements. ARSOF falls under the command of USASOC, which is headquartered at Fort Bragg, NC. USASOC is comprised of the following subordinate commands:

1. U.S. Army Special Forces Command (Airborne) (USASFC(A)).
....
2. The 75th Ranger Regiment, commanded by a Colonel, and its three battalions, are also ARSOF.
....
3. The 160th Special Operations Aviation Regiment (SOAR), commanded by a Colonel and located at Fort Campbell, KY, provides special aviation support to ARSOF, using specialized aircraft and highly-trained personnel.
....
4. The 95th Civil Affairs (CA) Brigade and four active component CA battalions fall under USASOC. Additionally, the 4th Psychological Operations Group (4th POG) falls under USASOC.
....
5. The John F. Kennedy Special Warfare Center and School (JFKSWCS) is responsible for training, leader development, and doctrine.
....
6. The Sustainment Brigade (Special Operations) (Airborne) provides Combat Service Support and Combat Health Support to ARSOF. ....

I suspect that the difference(s) also relate to the mission tasked, which from a legal standpoint include nine basic missions (headings only):

A. Direct Action (DA).
....
B. Special Reconnaissance (SR).
....
C. Foreign Internal Defense (FID).
....
D. Unconventional Warfare (UW).
....
E. Combating Terrorism.
....
F. Psychological Operations (pSYOP).
....
G. Civil Affairs (CA) Operations.
....
H. Counterproliferation (CP) of Weapons of Mass Destruction (WMD).
....
I. Information Operations (I0).

Finally, besides the nine mission (operational) areas, a number of collateral activities fall within the legal ambit of SOCOM. E.g., the following (headings only):

A. Coalition Support.
....
B. Combat Search and Rescue (CSAR).
....
C. Counterdrug Activities (CD).
....
D. Foreign Humanitarian Assistance (HA).
....
E. Countermine Activities.
....
F. Security Assistance (SA).
....
G. Peace Operations.
....
H. Special Activities. These are activities that are planned and executed so that the role of the U.S. Government is not apparent or acknowledged publicly. Special activities require a Presidential finding and Congressional oversight.

All of that is one heck of a mix of different missions and activities, as much driven by where funding and bodies are available than by logic (my perception).

So, I would like to hear the discussion from a practical standpoint. All the above tends to look very neat from a legal standpoint, but reality often differs.