The United States Navy faces some difficult questions after two deadly collisions during the summer of 2017.
More than a dozen sailors died in separate accidents. The destroyer USS Fitzgerald attacked a commercial ship off Japan's waters in June and killed seven American sailors. The destroyer USS John S. McCain collided with an oil tanker in coastal waters off Singapore in August, killing 10 American sailors.
Five officers involved in those two crashes have been charged with negligent homicide, the Navy said Tuesday.
Read on to see other recent US military incidents in the Pacific.
Seen here, a C-2A Greyhound logistics aircraft prepares to land on a ship in the Mediterranean Sea. Three sailors were lost after one of these aircraft crashed in the Philippine Sea in November 2017.
Three sailors were lost after an Armada plane crashed into the Philippine Sea shortly after takeoff from Japan in November 2017.
Eight more members of the crew on board The aircraft were rescued and listed in good condition in the
Deepwater rescue experts located the aircraft in early January 2018 and efforts are being made to recover the plane and the sailors, the Navy said.
USS John S. McCain
Ten sailors died when the USS John S. McCain collided with a merchant ship off the coast of Singapore.
The USS guided missile destroyer John S. McCain collided with the merchant ship Alnic MC on August 21, 2017, according to the Navy report.
Five sailors were injured and 10 sailors were killed.
No one aboard the 600-foot oil and chemical tanker was injured, the Singapore government said, although the ship suffered damage to a compartment in its forehead.
Singapore, at the southern tip of the Malay Peninsula, is one of the most active ports in the world and an ally of the United States. UU., With its naval base regularly visited by US warships.
The Navy said in a statement that the accident could have been avoided, adding that "it resulted mainly from complacency, confidence and lack of procedural compliance."
UH-60 Black Hawk Helicopter
In the image, a UH-60 Black Hawk helicopter delivers relief supplies to Saint Thomas in the US Virgin Islands. UU Five soldiers disappeared after one of these helicopters crashed off the coast of Hawaii in August 2017.
(Reuters / Jonathan Drake)
An Army Black Hawk helicopter crashed into the ocean off the coast of Hawaii on August 15, 2017.
Two Black Hawk crew members participated in training exercises when the communications were lost.
Crews from the Army, Coast Guard, Navy and local agencies in Hawaii recorded throughout the day how strong currents moved the debris in a deepwater search area that spanned 72,000 nautical miles.
The five soldiers who disappeared between the ages of 26 and 41. The crew had life jackets and devices to help breathe underwater in the helicopter, authorities said.
But while officers recovered significant debris from the accident, Army and Coast Guard officials said they found no signs of life and finished the search and rescue operation.
The five missing soldiers have been declared dead.
In the photo, an MV-22 Osprey takes off on its way to deliver aid to Puerto Rico and Saint Croix. Three US Marines UU They were declared dead in August 2017 after their MV-22 Osprey crashed off the coast of Australia.
(Reuters / Jonathan Drake)
Three US Marines were declared dead in August 2017 after their MV-22 Osprey crashed off the coast of Australia.
The MV-22 Osprey – part of a helicopter, part of the plane – crashed on the back of the USS Green Bay, an amphibious ship of the Navy, and fell to the sea on August 5.
The guided missile destroyer Arleigh Burke USS Fitzgerald, damaged by collision with a Philippine flag merchant ship, is seen at the US naval base in Yokosuka, Japan.
(Reuters / Toru Hanai)
Seven sailors, aged between 19 and 37 years, died in June 2017 when the USS Fitzgerald collided with a container ship in Japanese waters.
The captain of the ACX Crystal, a Philippine flag container ship, accused the Navy destroyer of not paying attention to warning signs before the June 17 accident.
"The collision between Fitzgerald and Crystal was avoidable and resulted from an accumulation of small errors over time in the lack of adherence to good navigation practices," the Navy said in the statement.
"Specifically, Fitzgerald's surveillance teams ignored the established basic contact management rules and, more importantly, the leadership did not adhere to established well-established protocols to avoid collisions," he added.
USS Lake Champlain
USS Lake Champlain guided missile cruiser is seen entering Sydney Harbor in 1998. It hit a South Korean fishing boat in the Sea of Japan in May 2017.
(Reuters / David Gray)
The USS Lake Champlain, a guided missile cruiser part of the US Navy's 7th fleet, collided with a South Korean fishing vessel in the Sea of Japan in May 2017.  No injuries were reported after the May 9 crash.
According to data from the US Navy. UU., The ship was carrying out routine operations in international waters at the time of the incident. A defense official said visibility was limited at that time.
The USS Louisiana ballistic missile submarine collided with an offshore support vessel of the US Navy. UU Off the coast of Washington State on August 18, 2016, according to the US Navy.
The accident occurred during routine operations in the Strait of Juan de Fuca.
While both ships were damaged, no one was injured in the collision.
The Associated Press contributed to this report.
Kaitlyn Schallhorn is a Fox News reporter. Follow her on Twitter @K_Schallhorn .