According to the Child Citizenship Act of 2000, internationally adopted children of U.S. citizens may file the USA citizenship application if the following conditions are met:
The U.S. government confers U.S. citizenship posthumously to some foreign nationals who died while serving in the U.S. army, air or naval forces during World War I, World War II, the Korean hostilities, the Vietnam hostilities, or in certain other periods of military hostilities.
All foreign nationals who died while in active duty are eligible for posthumous grant of U.S. citizenship provided:
A.
They served honorably in an active-duty status with the army, air, or naval forces of the U.S. during World War I, World War II, the Korean Hostilities, the Vietnam Hostilities, or in other periods of military hostilities designated by the President under Executive Order
B.
They died because of injury or disease incurred in or aggravated by service in the U.S. Armed Forces during a period of military hostilities, or
C.
They were discharged from active duty under honorable conditions, and died as a result of injury or disease incurred or aggravated by active duty service during a qualifying period of military hostilities
