Please help identify this music!

[pytheamateur]

The music is used as background from 17:48 to 18:42 of the video.
Is it from a symphony by Mahler or Bruckner?
Sorry, it's not a piano piece, but perhaps there might be a piano transcription of it.  If there is, please let me know as well.  Thank you!

[dogperson]

Barber 'Adagio for Strings' and it is available for piano {plus other options}

 

It was played during the Sept 11 memorial  as well as JFK's funeral
Really stunning for violin and piano IMHO

[pytheamateur]

Thanks very much Dogperson!

[dcstudio]

 

It was played during the Sept 11 memorial  as well as JFK's funeral
Really stunning for violin and piano IMHO

and lest we forget Platoon...    Sheen--DeFoe--Beringer  great flick.