With no explanation, label each line with "location-GPE", "O", "other-medical", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
It
was
developed
under
contract
to
Edgewood
Arsenal
during
the
1960s
as
part
of
the
US
military
chemical
weapons
program
,
during
research
to
improve
upon
the
properties
of
earlier
agents
such
as
QNB
.
It:O
was:O
developed:O
under:O
contract:O
to:O
Edgewood:organization-company
Arsenal:organization-company
during:O
the:O
1960s:O
as:O
part:O
of:O
the:O
US:location-GPE
military:O
chemical:O
weapons:O
program:O
,:O
during:O
research:O
to:O
improve:O
upon:O
the:O
properties:O
of:O
earlier:O
agents:O
such:O
as:O
QNB:other-medical
.:O