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 ":".
His
unit
was
based
in
Colorado
during
the
war
.
His:O
unit:O
was:O
based:O
in:O
Colorado:location-GPE
during:O
the:O
war:O
.:O