With no explanation, label each line with "organization-other", "person-soldier", "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
With
the
onset
of
the
Second
World
War
Walker
joined
the
Royal
Air
Force
.
With:O
the:O
onset:O
of:O
the:O
Second:event-attack/battle/war/militaryconflict
World:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
Walker:person-soldier
joined:O
the:O
Royal:organization-other
Air:organization-other
Force:organization-other
.:O