With no explanation, label each line with "O", "location-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
returned
to
Barksdale
Air
Force
Base
in
August
1983
as
commander
of
his
former
unit
,
the
917th
Tactical
Fighter
Group
.
He:O
returned:O
to:O
Barksdale:location-other
Air:location-other
Force:location-other
Base:location-other
in:O
August:O
1983:O
as:O
commander:O
of:O
his:O
former:O
unit:O
,:O
the:O
917th:O
Tactical:O
Fighter:O
Group:O
.:O