With no explanation, label each line with "O", "location-GPE", "other-law", "organization-sportsleague", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
Although
the
Selective
Training
and
Service
Act
of
1940
had
instituted
conscription
in
late
1940
,
the
NFL
was
not
significantly
impacted
until
after
the
United
States
joined
the
war
following
Pearl
Harbor
attack
in
December
1941
.
Although:O
the:O
Selective:other-law
Training:other-law
and:other-law
Service:other-law
Act:other-law
of:other-law
1940:other-law
had:O
instituted:O
conscription:O
in:O
late:O
1940:O
,:O
the:O
NFL:organization-sportsleague
was:O
not:O
significantly:O
impacted:O
until:O
after:O
the:O
United:location-GPE
States:location-GPE
joined:O
the:O
war:O
following:O
Pearl:event-attack/battle/war/militaryconflict
Harbor:event-attack/battle/war/militaryconflict
attack:event-attack/battle/war/militaryconflict
in:O
December:O
1941:O
.:O