<s>
The	O
Hughes	B-Device
AN/ASG	I-Device
-18	I-Device
Fire	I-Device
Control	I-Device
System	I-Device
was	O
a	O
prototype	O
airborne	O
fire	O
control	O
radar	O
system	O
for	O
the	O
planned	O
North	O
American	O
XF-108	O
Rapier	O
interceptor	O
aircraft	O
,	O
and	O
the	O
Lockheed	O
YF-12	O
for	O
the	O
United	O
States	O
Air	O
Force	O
.	O
</s>
<s>
It	O
was	O
the	O
US	O
's	O
first	O
Pulse-Doppler	B-Algorithm
radar	I-Algorithm
,	O
giving	O
it	O
look-down/shoot	O
-down	O
capability	O
,	O
and	O
was	O
also	O
the	O
first	O
track	B-Algorithm
while	I-Algorithm
scan	I-Algorithm
radar	O
(	O
could	O
track	O
one	O
target	O
at	O
a	O
time	O
)	O
.	O
</s>
<s>
This	O
was	O
paired	O
with	O
an	O
infrared	O
search	B-Algorithm
and	I-Algorithm
track	I-Algorithm
(	O
IRST	O
)	O
system	O
.	O
</s>
<s>
While	O
development	O
work	O
was	O
done	O
with	O
the	O
XF-108	O
,	O
the	O
AN/ASG	B-Device
-18	I-Device
and	O
Falcon	O
missiles	O
were	O
first	O
tested	O
on	O
a	O
highly	O
modified	O
Convair	O
B-58	O
Hustler	O
bomber	O
.	O
</s>
