With no explanation, label each line with "event-attack/battle/war/militaryconflict", "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
MCLCs
were
used
in
the
1991
Persian
Gulf
War
and
again
in
Operation
Iraqi
Freedom
in
2003
.
MCLCs:product-weapon
were:O
used:O
in:O
the:O
1991:O
Persian:event-attack/battle/war/militaryconflict
Gulf:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
and:O
again:O
in:O
Operation:event-attack/battle/war/militaryconflict
Iraqi:event-attack/battle/war/militaryconflict
Freedom:event-attack/battle/war/militaryconflict
in:O
2003:O
.:O