With no explanation, label each line with "location-GPE", "event-attack/battle/war/militaryconflict", "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
The
M249
SAW
was
not
used
heavily
before
the
1991
Gulf
War
,
though
it
has
been
used
in
every
major
U.S
.
conflict
since
.
The:O
M249:product-weapon
SAW:product-weapon
was:O
not:O
used:O
heavily:O
before:O
the:O
1991:O
Gulf:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
,:O
though:O
it:O
has:O
been:O
used:O
in:O
every:O
major:O
U.S:location-GPE
.:location-GPE
conflict:O
since:O
.:O