<s>
Marine	B-Application
Doom	I-Application
is	O
a	O
1996	O
modification	O
of	O
the	O
first-person	O
shooter	O
Doom	B-Application
II	I-Application
for	O
the	O
United	O
States	O
Marine	O
Corps	O
,	O
which	O
was	O
later	O
made	O
available	O
for	O
download	O
to	O
the	O
public	O
.	O
</s>
<s>
In	O
the	O
game	O
,	O
a	O
fireteam	B-Application
,	O
comprising	O
four	O
Marines	O
,	O
is	O
supposed	O
to	O
accomplish	O
a	O
specific	O
mission	O
,	O
the	O
default	O
being	O
the	O
destruction	O
of	O
an	O
enemy	O
bunker	O
,	O
although	O
other	O
scenarios	O
such	O
as	O
a	O
hostage	O
rescue	O
in	O
a	O
foreign	O
embassy	O
can	O
be	O
designed	O
.	O
</s>
<s>
The	O
fireteam	B-Application
consists	O
of	O
a	O
team	O
leader	O
,	O
two	O
riflemen	O
and	O
one	O
machine-gunner	O
.	O
</s>
<s>
A	O
group	O
of	O
U.S.	O
Marine	O
simulations	O
experts	O
originally	O
led	O
by	O
Major	O
Kirk	O
Skinner	O
,	O
including	O
Lieutenant	O
Luis	O
E	O
.	O
Velazquez	O
and	O
Lieutenant	O
Scott	O
Barnett	O
as	O
the	O
project	O
officers	O
with	O
Sergeant	O
Snyder	O
as	O
one	O
of	O
the	O
designers	O
and	O
modelers	O
,	O
in	O
Quantico	O
,	O
Virginia	O
of	O
the	O
Automated	O
Information	O
Systems	O
Office	O
,	O
and	O
later	O
Marine	O
Corps	O
Modeling	O
and	O
Simulation	O
Management	O
Office	O
(	O
MCMSMO	O
)	O
,	O
obtained	O
a	O
copy	O
of	O
the	O
commercial	O
Doom	B-Application
,	O
released	O
in	O
1993	O
by	O
id	O
Software	O
,	O
and	O
used	O
it	O
to	O
develop	O
a	O
simulation	O
that	O
focused	O
on	O
mutual	O
fireteam	B-Application
support	O
,	O
protection	O
of	O
the	O
automatic	O
rifleman	O
,	O
proper	O
sequencing	O
of	O
an	O
attack	O
,	O
ammunition	O
discipline	O
and	O
succession	O
of	O
command	O
.	O
</s>
<s>
Their	O
code	O
was	O
adapted	O
for	O
the	O
commercial	O
Doom	B-Application
II	I-Application
before	O
its	O
release	O
,	O
and	O
requires	O
a	O
commercial	O
copy	O
of	O
Doom	B-Application
II	I-Application
1.9	O
to	O
run	O
.	O
</s>
<s>
In	O
1997	O
,	O
video	O
game	O
publisher	O
GT	O
Interactive	O
acquired	O
the	O
rights	O
to	O
distribute	O
Marine	B-Application
Doom	I-Application
.	O
</s>
<s>
U.S.	O
Marine	O
Sergeant	O
Dan	O
Snyder	O
,	O
who	O
worked	O
on	O
the	O
mod	O
,	O
was	O
later	O
a	O
consultant	O
on	O
the	O
video	O
game	O
NAM	B-Application
.	O
</s>
