With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Despite
one
of
the
largest
rescue
efforts
carried
out
by
the
US
military
,
no
trace
of
the
aircraft
has
ever
been
found
.
Despite:O
one:O
of:O
the:O
largest:O
rescue:O
efforts:O
carried:O
out:O
by:O
the:O
US:location-GPE
military:O
,:O
no:O
trace:O
of:O
the:O
aircraft:O
has:O
ever:O
been:O
found:O
.:O