<s>
The	O
Saugatuck	B-Device
Gap	I-Device
Filler	I-Device
Annex	I-Device
(	O
ADC	O
ID	O
:	O
P-67C	O
,	O
NORAD	O
ID	O
:	O
Z-67C	O
,	O
Z-34G	O
)	O
is	O
a	O
decommissioned	O
radar	O
installation	O
that	O
once	O
served	O
in	O
the	O
vast	O
Cold	O
War	O
era	O
Semi-Automatic	B-Device
Ground	I-Device
Environment	I-Device
(	O
SAGE	O
)	O
air	O
defense	O
system	O
.	O
</s>
<s>
The	O
Saugatuck	B-Device
Gap	I-Device
Filler	I-Device
Annex	I-Device
was	O
listed	O
on	O
the	O
National	O
Register	O
of	O
Historic	O
Places	O
in	O
2022	O
,	O
and	O
efforts	O
are	O
underway	O
by	O
a	O
work	O
group	O
commissioned	O
by	O
the	O
city	O
of	O
Saugatuck	O
to	O
stabilize	O
the	O
site	O
and	O
secure	O
funding	O
for	O
further	O
preservation	O
and	O
restoration	O
.	O
</s>
<s>
The	O
system	O
that	O
emerged	O
to	O
satisfy	O
this	O
requirement	O
was	O
SAGE	O
,	O
the	O
Semi-Automatic	B-Device
Ground	I-Device
Environment	I-Device
,	O
a	O
continent-wide	O
network	O
of	O
enormous	O
AN/FSQ	B-Device
-7	I-Device
computers	O
linked	O
to	O
hundreds	O
of	O
radars	O
.	O
</s>
<s>
Ultimately	O
,	O
a	O
maximum	O
of	O
131	O
gap-fillers	O
were	O
in	O
service	O
at	O
any	O
one	O
time	O
,	O
the	O
Saugatuck	B-Device
Gap	I-Device
Filler	I-Device
Annex	I-Device
among	O
them	O
.	O
</s>
<s>
Like	O
the	O
other	O
three	O
gap-fillers	O
under	O
the	O
control	O
of	O
Custer	O
AFS	O
,	O
the	O
Saugatuck	B-Device
Gap	I-Device
Filler	I-Device
Annex	I-Device
was	O
designed	O
to	O
be	O
unmanned	O
and	O
was	O
operated	O
remotely	O
by	O
the	O
prime	O
site	O
.	O
</s>
<s>
Also	O
,	O
like	O
the	O
other	O
gap-fillers	O
,	O
the	O
Saugatuck	O
annex	O
employed	O
AN/FST	O
-1	O
Coordinate	O
Data	O
Transmitter	O
to	O
send	O
radar	O
data	O
to	O
the	O
immense	O
AN/FSQ	B-Device
-7	I-Device
computer	O
housed	O
at	O
SAGE	O
Direction	O
Center	O
DC-06	O
,	O
co-located	O
with	O
the	O
781st	O
AC&W	O
Squadron	O
at	O
Custer	O
AFS	O
.	O
</s>
<s>
The	O
Saugatuck	B-Device
Gap	I-Device
Filler	I-Device
Annex	I-Device
was	O
redesignated	O
Z-34G	O
and	O
recommissioned	O
on	O
February	O
2	O
,	O
1965	O
.	O
</s>
<s>
On	O
April	O
1	O
,	O
1968	O
,	O
the	O
Saugatuck	B-Device
Gap	I-Device
Filler	I-Device
Annex	I-Device
was	O
permanently	O
deactivated	O
.	O
</s>
<s>
In	O
September	O
2017	O
,	O
the	O
Saugatuck-Douglas	O
History	O
Center	O
(	O
SDHC	O
)	O
submitted	O
a	O
preliminary	O
questionnaire	O
to	O
the	O
Michigan	O
State	O
Historic	O
Preservation	O
Office	O
(	O
SHPO	O
)	O
to	O
determine	O
if	O
the	O
Saugatuck	B-Device
Gap	I-Device
Filler	I-Device
Annex	I-Device
was	O
eligible	O
for	O
inclusion	O
in	O
the	O
National	O
Register	O
of	O
Historic	O
Places	O
(	O
NRHP	O
)	O
.	O
</s>
<s>
SHPO	O
,	O
which	O
acts	O
as	O
the	O
gateway	O
to	O
the	O
NRHP	O
,	O
concluded	O
the	O
annex	O
was	O
significant	O
for	O
its	O
role	O
in	O
the	O
nationwide	O
Cold	O
War	O
SAGE	B-Device
system	I-Device
and	O
appeared	O
to	O
merit	O
listing	O
on	O
the	O
Register	O
.	O
</s>
<s>
In	O
support	O
of	O
the	O
NRHP	O
nomination	O
,	O
research	O
was	O
conducted	O
to	O
determine	O
how	O
many	O
of	O
the	O
original	O
SAGE	B-Device
system	I-Device
radar	O
sites	O
remain	O
and	O
their	O
present	O
condition	O
.	O
</s>
<s>
The	O
results	O
indicate	O
that	O
,	O
of	O
the	O
hundreds	O
of	O
SAGE	B-Device
system	I-Device
radars	O
scattered	O
across	O
the	O
United	O
States	O
when	O
SAGE	O
was	O
fully	O
implemented	O
,	O
only	O
four	O
remain	O
with	O
structure	O
and	O
antenna	O
appearing	O
substantially	O
as	O
they	O
did	O
during	O
the	O
Cold	O
War	O
era	O
.	O
</s>
<s>
Of	O
these	O
,	O
the	O
Saugatuck	B-Device
Gap	I-Device
Filler	I-Device
Annex	I-Device
is	O
one	O
of	O
,	O
at	O
most	O
,	O
two	O
which	O
have	O
survived	O
almost	O
completely	O
intact	O
with	O
most	O
of	O
the	O
Cold	O
War	O
era	O
radar	O
equipment	O
still	O
in	O
place	O
in	O
the	O
radome	O
and	O
building	O
,	O
although	O
all	O
of	O
the	O
vacuum	O
tubes	O
and	O
fragile	O
equipment	O
are	O
currently	O
stored	O
off-site	O
.	O
</s>
<s>
The	O
lengthy	O
process	O
of	O
listing	O
the	O
Saugatuck	B-Device
Gap	I-Device
Filler	I-Device
Annex	I-Device
on	O
the	O
National	O
Register	O
of	O
Historic	O
Places	O
was	O
successfully	O
concluded	O
in	O
late	O
2022	O
.	O
</s>
<s>
Meanwhile	O
,	O
the	O
Friends	O
stand	O
ready	O
to	O
assist	O
as	O
the	O
city	O
determines	O
what	O
the	O
next	O
steps	O
should	O
be	O
in	O
preserving	O
the	O
Saugatuck	B-Device
Gap	I-Device
Filler	I-Device
Annex	I-Device
,	O
the	O
last	O
nearly	O
intact	O
SAGE	B-Device
system	I-Device
radar	O
facility	O
in	O
public	O
hands	O
where	O
the	O
Cold	O
War	O
structures	O
and	O
radar	O
equipment	O
can	O
be	O
examined	O
in	O
situ	O
.	O
</s>
<s>
The	O
Saugatuck	B-Device
Gap	I-Device
Filler	I-Device
Radar	I-Device
Annex	I-Device
is	O
located	O
at	O
the	O
top	O
of	O
Mount	O
Baldhead	O
,	O
a	O
small	O
dune	O
.	O
</s>
