<s>
Naval	B-Application
Ops	I-Application
:	I-Application
Warship	I-Application
Gunner	I-Application
,	O
released	O
in	O
Japan	O
as	O
is	O
a	O
vehicle	O
simulation	O
game	O
released	O
in	O
2003	O
for	O
the	O
PlayStation	B-Device
2	I-Device
.	O
</s>
<s>
It	O
is	O
an	O
entry	O
in	O
the	O
larger	O
Kurogane	O
no	O
Houkou	O
series	O
,	O
which	O
also	O
includes	O
the	O
games	O
Naval	B-Device
Ops	I-Device
:	I-Device
Commander	I-Device
and	O
Naval	B-Application
Ops	I-Application
:	I-Application
Warship	I-Application
Gunner	I-Application
2	I-Application
.	O
</s>
<s>
There	O
are	O
also	O
two	O
sequel	O
games	O
called	O
Naval	B-Device
Ops	I-Device
:	I-Device
Commander	I-Device
which	O
offers	O
pretty	O
much	O
of	O
the	O
same	O
gameplay	O
,	O
however	O
the	O
battle	O
scenes	O
are	O
fought	O
out	O
in	O
a	O
top	O
down	O
view	O
which	O
makes	O
things	O
a	O
little	O
easier	O
,	O
and	O
a	O
later	O
sequel	O
,	O
Naval	B-Application
Ops	I-Application
:	I-Application
Warship	I-Application
Gunner	I-Application
2	I-Application
,	O
which	O
returned	O
to	O
Warship	B-Application
Gunner	I-Application
's	O
style	O
of	O
gameplay	O
,	O
but	O
with	O
a	O
new	O
story	O
.	O
</s>
<s>
John	O
Birmingham	O
's	O
Axis	O
of	O
Time	O
Trilogy	O
begins	O
in	O
a	O
manner	O
similar	O
to	O
Warship	B-Application
Gunner	I-Application
's	O
opening	O
scene	O
.	O
</s>
<s>
Like	O
Warship	B-Application
Gunner	I-Application
,	O
industrial	O
technology	O
following	O
the	O
modern-day	O
task	O
force	O
's	O
arrival	O
develops	O
at	O
an	O
alarming	O
pace	O
;	O
in	O
a	O
few	O
years	O
time	O
,	O
the	O
Allies	O
develop	O
jet	O
fighters	O
and	O
helicopters	O
not	O
due	O
until	O
almost	O
a	O
half-century	O
later	O
.	O
</s>
<s>
Aside	O
from	O
the	O
aforementioned	O
Warship	O
Commander	O
subseries	O
and	O
Naval	B-Application
Ops	I-Application
:	I-Application
Warship	I-Application
Gunner	I-Application
2	I-Application
,	O
there	O
was	O
also	O
a	O
Gunner	O
spinoff	O
titled	O
Boukoku	O
no	O
Aegis	O
2035	O
:	O
Warship	B-Application
Gunner	I-Application
released	O
by	O
Koei	O
in	O
2005	O
,	O
based	O
on	O
the	O
novel	O
and	O
film	O
.	O
</s>
