<s>
Aces	B-Protocol
High	I-Protocol
(	O
formerly	O
known	O
as	O
Aces	B-Protocol
High	I-Protocol
II	I-Protocol
)	O
is	O
a	O
combat	O
flight	O
simulation	O
and	O
massively	B-Application
multiplayer	I-Application
online	I-Application
game	I-Application
for	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
While	O
the	O
main	O
focus	O
of	O
Aces	B-Protocol
High	I-Protocol
is	O
on	O
World	O
War	O
II	O
aerial	O
combat	O
,	O
there	O
is	O
also	O
a	O
smaller	O
selection	O
of	O
ground	O
vehicles	O
,	O
ships	O
,	O
and	O
World	O
War	O
I	O
aircraft	O
.	O
</s>
<s>
Aces	B-Protocol
High	I-Protocol
is	O
an	O
open-ended	O
combat	O
flight	O
simulator	O
,	O
where	O
players	O
can	O
fly	O
online	O
or	O
offline	O
,	O
and	O
engage	O
other	O
players	O
in	O
air	O
,	O
land	O
,	O
or	O
sea-based	O
combat	O
.	O
</s>
<s>
The	O
main	O
(	O
and	O
original	O
)	O
focus	O
of	O
Aces	B-Protocol
High	I-Protocol
is	O
World	O
War	O
II	O
aerial	O
combat	O
.	O
</s>
<s>
Scenarios	O
are	O
special	O
large-scale	O
battles	O
in	O
Aces	B-Protocol
High	I-Protocol
that	O
run	O
a	O
2-3	O
times	O
per	O
year	O
.	O
</s>
<s>
Usually	O
,	O
they	O
are	O
based	O
on	O
actual	O
World	O
War	O
II	O
battles	O
,	O
such	O
as	O
the	O
Battle	B-Application
of	I-Application
Britain	I-Application
.	O
</s>
