By Richard HeylinPump jet submarines and unsupervised submarine warfare are being used by the US to fight China in the South China Sea.
The US is believed to be using the weapons in international waters in the area.
Pump jets are powerful, powerful and can operate for hours, so the US has a great advantage in terms of the numbers of people that it can attack.
But there are a number of things that make it less attractive than a traditional submarine or submarine warfare.
Firstly, it is less expensive to build.
The most expensive of these is the USS George H W Bush, which was launched in 2002 and cost about $1 billion.
Second, the cost is higher.
The cost of a submarine has been falling since the 1960s.
Third, the submarines themselves are relatively small, and they are not used to attack targets very far away.
Fourth, there are many different types of weapons.
Each type of weapon has a different type of payload.
The United States uses different types for different purposes.
For example, the US is now targeting Chinese ships in the Yellow Sea with the USS Donald Cook.
The Chinese have not deployed any anti-submarine weapons to the area, and so the Trump administration has been using a different tactic.
The USS George W Bush is carrying out a reconnaissance mission in the waters off the Korean Peninsula, while the USS Theodore Roosevelt is in the same area.
The Theodore Roosevelt has an air-launched cruise missile.
Pumped jets can be launched from aircraft.
They have been deployed for other purposes.
For example, a US F-15 Eagle is capable of taking off from the USS John Paul Jones.
The F-35B Lightning II, a fighter jet, can also launch its own missiles from the aircraft carrier Gerald R Ford.
It is important to remember that submarines are not a new weapon.
They were developed during the Cold War and are capable of destroying targets far from their home waters.
The Trump administration may use the Chinese threat as an excuse to expand its military presence in the region, while at the same time expanding the US military in the Pacific.
This is a risk that China will not want to take.