the US Navy's seven fleets, three are deployed in or near potential hotspots around the world.

Of the US Navy's seven fleets, three are deployed in or near potential hotspots around the world.  (U.S. Navy photo by Mass Communication Specialist 2nd Class Josue L. Escobosa/Released)

The Navy's 6th Fleet is stationed around the Strait of Gibraltar; the 5th is by Saudi Arabia; and the 7th is near Japan and the Pacific Ocean.

The Navy's 6th Fleet is stationed around the Strait of Gibraltar; the 5th is by Saudi Arabia; and the 7th is near Japan and the Pacific Ocean.  (Skye Gould/Business Insider)

The USS Carney, Ross, Porter, and Donald Cook are destroyer ships part of the 6th Navy Fleet, which contains 17 ships and 12,638 sailors.

The USS Bataan and George H.W. Bush are part of the 5th, which consists of 24 ships and 16,731 service members. The Bush is patrolling the Persian Gulf, while the Bataan is south of Yemen.

The USS Reagan, Bonhomme Richard, Carl Vinson, and Makin Island are part of the 7th, which consists of 53 ships and 37,935 sailors.

The 7th fleet has experienced three high-profile accidents of late that resulted in deaths. The USS John S. McCain and USS Fitzgerald both collided with merchant ships, and the USS Antietam ran aground in Tokyo Bay.

Analysts have offered many explanations as to why these accidents keep happening, like lengthy at-sea periods that come with being deployed in the Pacific.

US Marines are deployed around the world to help counter the Islamic State. Some are also deployed in efforts to contain Russia and to provide security.

US Marines are deployed around the world to help counter the Islamic State. Some are also deployed in efforts to contain Russia and to provide security.  (US Marine Corps)

Here are some of the most important Marine deployments.

Here are some of the most important Marine deployments.  (Skye Gould/Business Insider)

In Syria, approximately 400 Marines are taking part in Operation Inherent Resolve.

In Afghanistan, 300 Marines are taking part in Resolute Support.

In South Sudan, approximately 40 US Marines are providing security to the US Embassy.

In Norway, about 300 Marines are stationed as part of a bilateral agreement between Oslo and Washington to undergo winter training and reinforce Norway's border with Russia.