Working with the world

The U.S. Marines don't often work with the forces of other countries, less than some other branches of the armed services like the Air Force and the Army, but sometimes the work with others pretty well.

 As part of the United States Militery Training Mission to Saudi Arabia:

"The U.S. Marine Corps Technical Assistance Field Team (TAFT), is based in the Royal Saudi Naval Forces Headquarters, Riyadh. The TAFT provides advisors to both Saudi Marine Forces Brigades in Jubail and Qadimah. Additionally, they provide technical advice to the Director of Marine Forces Schools at Ras al Gar. Advisor duties reflect the full range of combat skills to include field exercises, CPX, assault support training, and live-fire for individual, crew-served, and TOW missile systems. Organized to support Saudi Marine Forces Brigade Commanders, they provide advice and recommendations to both the Eastern and Western Fleet Commanders. " http://www.globalsecurity.org/

And the Scottish, March 2011:

Scottish soldiers and US Marines mark historic relationship

In fact there is a whole Marine Corps Foreign Personnel Exchange Program. "The Marine Corps Foreign Personnel Exchange Program (MCFPEP) is a means of continuing a long-term, selectively visible presence and association among military counterparts to enhance worldwide security cooperation."  http://www.marines.mil/unit/aviation/Pages/PersonalExchangePrograms.aspx

"The MCFPEP began during combined operations in World War II when a critical need to exchange and standardize operational doctrines between allied forces was identified, according to Marine Corps Order 5700.4E. More recently, a reduction in U.S. military presence in several regions around the world has created a need for closer relationships between friendly nations and coalition partners. MCFPEP is one means of continuing a long-term presence and association among military counterparts to enhance worldwide security cooperation.
The MCFPEP began during combined operations in World War II when a critical need to exchange and standardize operational doctrines between allied forces was identified, according to Marine Corps Order 5700.4E. More recently, a reduction in U.S. military presence in several regions around the world has created a need for closer relationships between friendly nations and coalition partners. MCFPEP is one means of continuing a long-term presence and association among military counterparts to enhance worldwide security cooperation." US Marine major flies with Royal Navy forces in Afghanistan 

9/15/2010 By Sgt. Deanne Hurla
3rd Marine Aircraft Wing (FWD)
U.S. Marine Maj. Joshua Nelson, an Mk4 "Sea King" pilot with 846 Naval Air Squadron, Commando Helicopter Force in the Royal Navy, is participating in the Marine Corps Foreign Personnel Exchange Program. Nelson is a CH-46E "Sea Knight" pilot for the Corps, but has flown the Sea King for a year and a half with the Royal Navy. The MCFPEP was created during World War II to keep close relationships between friendly nations and coalition partners.

 And of course they can come to us as well:

British Troops on US soil "sharing through "Foreign Exchange" program. Image: US Marines, sailors share "best practices" with Malaysian Rangers

http://www.examiner.com/

Why?

Training with allied forces on foreign terrain introduces new obstacles and allows for the development of new war-fighting tactics, or the honing of existing doctrine specific to a region. Joint training also enables the sharing of tactics between U.S. service members and ally counterparts. Strength through unity is at the heart of this concept.
Military forces of allied nations training side-by-side enhances military interoperability and strengthens the allied fighting forces as a whole. http://www.travelblog.org/Asia/South-Korea/blog-460333.html