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 ":".
This
marked
the
beginning
of
large
scale
United
States
military
operations
in
Southeast
Asia
.
This:O
marked:O
the:O
beginning:O
of:O
large:O
scale:O
United:location-GPE
States:location-GPE
military:O
operations:O
in:O
Southeast:O
Asia:location-GPE
.:O