With no explanation, label each line with "O", "organization-government/governmentagency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
spring
1941
,
he
was
commissioned
into
the
Royal
Navy
Volunteer
Reserve
.
In:O
spring:O
1941:O
,:O
he:O
was:O
commissioned:O
into:O
the:O
Royal:organization-government/governmentagency
Navy:organization-government/governmentagency
Volunteer:organization-government/governmentagency
Reserve:organization-government/governmentagency
.:O