With no explanation, label each line with "organization-other", "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
In
the
Vietnam
War
,
Combat
Controllers
helped
assure
mission
safety
and
expedited
air
traffic
flow
during
countless
airlifts
.
In:O
the:O
Vietnam:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
,:O
Combat:organization-other
Controllers:organization-other
helped:O
assure:O
mission:O
safety:O
and:O
expedited:O
air:O
traffic:O
flow:O
during:O
countless:O
airlifts:O
.:O