With no explanation, label each line with "building-other", "O", "event-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
However
,
the
use
of
Vandenberg
AFB
for
space
shuttle
missions
was
canceled
after
the
``
Challenger
''
disaster
in
1986
.
However:O
,:O
the:O
use:O
of:O
Vandenberg:building-other
AFB:building-other
for:O
space:O
shuttle:O
missions:O
was:O
canceled:O
after:O
the:event-other
``:event-other
Challenger:event-other
'':event-other
disaster:event-other
in:O
1986:O
.:O