With no explanation, label each line with "organization-other", "O", "event-sportsevent", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
After
service
in
the
First
World
War
,
the
regiment
retitled
as
7th
Queen
's
Own
Hussars
in
1921
.
After:O
service:O
in:O
the:O
First:event-sportsevent
World:event-sportsevent
War:event-sportsevent
,:O
the:O
regiment:O
retitled:O
as:O
7th:organization-other
Queen:organization-other
's:organization-other
Own:organization-other
Hussars:organization-other
in:O
1921:O
.:O