<s>
Secret	B-Application
Service	I-Application
(	O
also	O
known	O
as	O
Secret	B-Application
Service	I-Application
:	I-Application
Ultimate	I-Application
Sacrifice	I-Application
)	O
is	O
a	O
first-person	O
shooter	O
video	O
game	O
developed	O
by	O
Cauldron	O
HQ	O
and	O
published	O
by	O
Activision	O
for	O
Microsoft	B-Application
Windows	I-Application
,	O
PlayStation	B-Device
2	I-Device
and	O
Xbox	B-Operating_System
360	I-Operating_System
.	O
</s>
<s>
On	O
the	O
day	O
of	O
the	O
Presidential	O
inauguration	O
Secret	B-Application
Service	I-Application
agent	O
Pierce	O
,	O
a	O
member	O
of	O
current	O
President	O
Simon	O
's	O
personal	O
detail	O
,	O
receives	O
a	O
phone	O
call	O
from	O
an	O
unknown	O
caller	O
who	O
goes	O
by	O
the	O
name	O
"	O
Semper	O
"	O
;	O
Latin	O
for	O
"	O
always	O
"	O
or	O
"	O
ever	O
"	O
.	O
</s>
<s>
He	O
warns	O
that	O
the	O
President	O
is	O
in	O
danger	O
and	O
that	O
someone	O
at	O
the	O
top	O
has	O
compromised	O
the	O
Secret	B-Application
Service	I-Application
warning	O
that	O
"	O
tyrants	O
are	O
everywhere	O
"	O
.	O
</s>
<s>
En	O
route	O
to	O
the	O
White	O
House	O
,	O
Pierce	O
is	O
told	O
to	O
stand	O
down	O
on	O
orders	O
of	O
Special	O
Agent	O
Kauffman	O
,	O
the	O
man	O
in	O
charge	O
of	O
the	O
Secret	B-Application
Service	I-Application
Protection	O
Division	O
,	O
but	O
later	O
on	O
while	O
still	O
in	O
the	O
tunnels	O
,	O
Pierce	O
learns	O
that	O
President	O
Simon	O
died	O
from	O
his	O
wounds	O
.	O
</s>
<s>
Pierce	O
must	O
fight	O
,	O
non-lethally	O
,	O
through	O
Secret	B-Application
Service	I-Application
agents	O
ordered	O
to	O
stop	O
him	O
because	O
he	O
has	O
been	O
classified	O
as	O
a	O
rogue	O
agent	O
.	O
</s>
<s>
The	O
gameplay	O
is	O
very	O
similar	O
to	O
Die	B-Application
Hard	I-Application
:	I-Application
Vendetta	I-Application
,	O
the	O
James	O
Bond	O
games	O
,	O
and	O
Soldier	B-Application
of	I-Application
Fortune	I-Application
:	I-Application
Payback	I-Application
.	O
</s>
<s>
It	O
also	O
uses	O
the	O
same	O
reloading	O
animations	O
from	O
Soldier	B-Application
of	I-Application
Fortune	I-Application
:	I-Application
Payback	I-Application
and	O
007	B-Application
:	I-Application
Agent	I-Application
Under	I-Application
Fire	I-Application
.	O
</s>
<s>
Secret	B-Application
Service	I-Application
has	O
received	O
generally	O
negative	O
reviews	O
.	O
</s>
<s>
It	O
has	O
an	O
aggregate	O
score	O
of	O
49.50	O
%	O
on	O
GameRankings	O
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
based	O
on	O
4	O
reviews	O
.	O
</s>
<s>
IGN	O
reviewer	O
Charles	O
Onyett	O
awarded	O
the	O
Microsoft	B-Application
Windows	I-Application
and	O
Xbox	B-Operating_System
360	I-Operating_System
version	O
a	O
4.5	O
rating	O
,	O
praising	O
some	O
of	O
the	O
game	O
's	O
artificial	B-Application
intelligence	I-Application
for	O
having	O
a	O
bit	O
of	O
challenge	O
.	O
</s>
