With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
was
discharged
from
his
military
duty
on
December
30
,
2016
after
serving
21
months
of
active
duty
at
the
17th
division
in
Incheon
.
He:O
was:O
discharged:O
from:O
his:O
military:O
duty:O
on:O
December:O
30:O
,:O
2016:O
after:O
serving:O
21:O
months:O
of:O
active:O
duty:O
at:O
the:O
17th:O
division:O
in:O
Incheon:location-GPE
.:O