Bureaucratic "impediments" with India have disrupted efforts by the US Government to recover the remains of several hundred of their military aviators who crashed and died in the country's remote northeast region during World War II.
Some 500-600 United States warplanes crashed in the 1940s in hazardous missions over the Himalayas against the Japanese.
They came down in the thickly-forested Arunachal Pradesh state bordering Tibet and Burma - then known as the North East Frontier Agency - while operating a perilous air-lift to sustain Allied troops and China's Kuomintang army fighting the advancing Japanese.
The route was known as "the hump" because of the 4500m high ridges which the rudimentary aircraft had to navigate with little or no instrumentation in winds of over 160km/h. But it became known as the "aluminum trail" due to the number of wrecks that marked its path.
Over decades, families of the dead pilots and teams from the US Joint POW/MIA Accounting Command (JPAC) in Honolulu identified several crash sites.