<s>
A	O
guided	O
bomb	O
(	O
also	O
known	O
as	O
a	O
smart	B-Device
bomb	I-Device
,	O
guided	O
bomb	O
unit	O
,	O
or	O
GBU	O
)	O
is	O
a	O
precision-guided	O
munition	O
designed	O
to	O
achieve	O
a	O
smaller	O
circular	O
error	O
probable	O
(	O
CEP	O
)	O
.	O
</s>
<s>
The	O
Germans	O
were	O
first	O
to	O
introduce	O
Precision	O
Guided	O
Munitions	O
(	O
PGMs	O
)	O
in	O
combat	O
,	O
using	O
the	O
1,400	O
-kg	O
(	O
3,100	O
lb	O
)	O
MCLOS-guidance	O
Fritz	O
X	O
to	O
successfully	O
attack	O
the	O
Italian	O
battleship	B-Application
Roma	O
in	O
September	O
1943	O
.	O
</s>
<s>
GBU-12s	O
were	O
used	O
to	O
great	O
effect	O
in	O
the	O
first	O
Gulf	B-Application
War	I-Application
,	O
dropped	O
from	O
F-111F	O
aircraft	O
to	O
destroy	O
Iraqi	O
armored	O
vehicles	O
in	O
a	O
process	O
referred	O
to	O
as	O
"	O
tank	O
plinking.	O
"	O
</s>
<s>
Lessons	O
learned	O
during	O
the	O
first	O
Gulf	B-Application
War	I-Application
showed	O
the	O
value	O
of	O
precision	O
munitions	O
,	O
yet	O
they	O
also	O
highlighted	O
the	O
difficulties	O
in	O
employing	O
them	O
—	O
specifically	O
when	O
visibility	O
of	O
the	O
ground	O
or	O
target	O
from	O
the	O
air	O
was	O
degraded	O
.	O
</s>
<s>
Its	O
usage	O
increased	O
after	O
the	O
success	O
of	O
the	O
weapon	O
in	O
the	O
Gulf	B-Application
War	I-Application
.	O
</s>
<s>
GBU-12	O
Paveway	O
IIs	O
were	O
used	O
to	O
great	O
effect	O
in	O
the	O
first	O
Gulf	B-Application
War	I-Application
,	O
dropped	O
from	O
F-111F	O
aircraft	O
to	O
destroy	O
Iraqi	O
armored	O
vehicles	O
in	O
a	O
process	O
referred	O
to	O
as	O
"	O
tank	O
plinking	O
"	O
.	O
</s>
<s>
Lessons	O
learned	O
during	O
the	O
first	O
Gulf	B-Application
War	I-Application
showed	O
the	O
value	O
of	O
guided	O
bombs	O
,	O
with	O
precision-guided	O
munitions	O
accounting	O
for	O
70%	O
of	O
munitions	O
expended	O
during	O
Operation	O
Enduring	O
Freedom	O
.	O
</s>
