With no explanation, label each line with "product-other", "O", "building-airport", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-hospital" preceded by ":".
Crews
from
the
group
's
75th
and
390th
squadrons
trained
with
B-25s
at
Hammer
Field
and
McClellan
Field
in
California
before
the
air
echelon
departed
for
its
new
assignment
on
6
March
.
Crews:O
from:O
the:O
group:O
's:O
75th:O
and:O
390th:O
squadrons:O
trained:O
with:O
B-25s:product-other
at:O
Hammer:building-airport
Field:building-airport
and:O
McClellan:building-airport
Field:building-airport
in:O
California:building-airport
before:O
the:O
air:O
echelon:O
departed:O
for:O
its:O
new:O
assignment:O
on:O
6:O
March:O
.:O