The link to 'ingeb' was posted in the main thread, 26268: Kamerad
Here is the link again, as Thierry has posted above: Ich Hatt' einen Kameraden

The poem is printed under its original title (pointed out by Wolfgang) of "Der gute Kamerad" at Univ. Stuttgart, Hilaritas, website: guterkamerad
The words are identical to those given in 'ingeb' and, I presume, are those of Uhland, 1807. The Hilaritas website says "'Der gute Kamerad' ist das offizielle Trauerlied der Bundesrepublik Deutschland. Es wird meist im Rahmen von militãrischen oder zivilen Gedenkveranstaltungen von einem einzelnen Trompeter gespielt und dabei nicht gesungen.
Wir singen dieses Lied fast ausschluesslich im Rahmen der Trauerkneipe, im Gedenken an unsere in den Kriegen gefallenen Bundes brüder.

Perhaps Wolfgang would comment on these practices.

The poem was written in Napoleonic times; its popularity continues to the present. It is known in translation in several European languages as well as English. It's significance is understood by anyone who has served and lost a comrade.