<s>
The	O
Transformational	B-Operating_System
Satellite	I-Operating_System
Communications	I-Operating_System
System	I-Operating_System
(	O
TSAT	O
)	O
program	O
was	O
a	O
United	O
States	O
Department	O
of	O
Defense	O
(	O
DOD	O
)	O
program	O
sponsored	O
by	O
the	O
U.S.	O
Air	O
Force	O
for	O
a	O
secure	O
,	O
high-capacity	O
global	O
communications	O
network	O
serving	O
the	O
Department	O
of	O
Defense	O
,	O
NASA	O
and	O
the	O
United	O
States	O
Intelligence	O
Community	O
(	O
IC	O
)	O
.	O
</s>
<s>
The	O
Transformational	B-Operating_System
Satellite	I-Operating_System
Communications	I-Operating_System
System	I-Operating_System
(	O
TSAT	O
)	O
aimed	O
to	O
provide	O
the	O
Department	O
of	O
Defense	O
(	O
DoD	O
)	O
with	O
high	O
data	O
rate	O
Military	O
Satellite	B-Application
Communications	O
(	O
MILSATCOM	O
)	O
and	O
Internet-like	O
services	O
as	O
defined	O
in	O
the	O
Transformational	O
Communications	O
Architecture	O
(	O
TCA	O
)	O
.	O
</s>
<s>
As	O
the	O
spaceborne	O
element	O
of	O
the	O
Global	O
Information	O
Grid	O
(	O
GIG	O
)	O
,	O
TSAT	O
would	O
extend	O
the	O
GIG	O
to	O
users	O
without	O
terrestrial	O
connections	O
providing	O
improved	O
connectivity	O
and	O
data	O
transfer	O
capability	O
,	O
vastly	O
improving	O
satellite	B-Application
communications	O
for	O
the	O
warfighter	O
.	O
</s>
<s>
TSAT	O
's	O
Internet	B-Protocol
Protocol	I-Protocol
(	O
IP	O
)	O
routing	O
would	O
connect	O
thousands	O
of	O
users	O
through	O
networks	O
rather	O
than	O
limited	O
point-to-point	O
connections	O
.	O
</s>
<s>
The	O
TSAT	O
program	O
was	O
planned	O
as	O
a	O
five	O
satellite	B-Application
constellation	O
(	O
a	O
sixth	O
satellite	B-Application
was	O
planned	O
as	O
a	O
spare	O
to	O
ensure	O
mission	O
availability	O
)	O
,	O
TSAT	O
satellite	B-Application
operations	O
centers	O
(	O
TSOC	O
)	O
for	O
on-orbit	O
control	O
,	O
TSAT	O
Mission	O
Operations	O
Systems	O
(	O
TMOS	O
)	O
to	O
provide	O
network	O
management	O
,	O
and	O
ground	O
gateways	O
.	O
</s>
<s>
These	O
technologies	O
include	O
but	O
are	O
not	O
limited	O
to	O
:	O
single	O
and	O
multi-access	O
laser	O
communications	O
(	O
to	O
include	O
wide	O
field-of-view	O
technology	O
)	O
,	O
Internet	B-Protocol
protocol	I-Protocol
based	O
packet	B-Protocol
switching	I-Protocol
,	O
bulk	O
and	O
packet	O
encryption/decryption	O
,	O
battle	O
command-on-the-move	O
antennas	O
,	O
dynamic	O
bandwidth	O
and	O
resource	O
allocation	O
techniques	O
,	O
and	O
protected	O
bandwidth	O
efficient	O
modulation	O
.	O
</s>
<s>
An	O
Interim	O
Program	O
Review	O
was	O
held	O
22	O
October	O
2004	O
;	O
the	O
Milestone	O
Decision	O
Authority	O
(	O
MDA	O
)	O
directed	O
the	O
TSAT	O
program	O
to	O
continue	O
as	O
planned	O
to	O
achieve	O
the	O
delivery	O
,	O
launch	O
,	O
and	O
on-orbit	O
checkout	O
of	O
the	O
first	O
TSAT	O
satellite	B-Application
.	O
</s>
<s>
In	O
July	O
2007	O
,	O
Lockheed	O
Martin	O
and	O
Northrop	O
Grumman	O
announced	O
a	O
plan	O
to	O
develop	O
an	O
IPv6-based	O
networking	O
system	O
with	O
Juniper	O
Networks	O
for	O
the	O
TSAT	O
project	O
.	O
</s>
<s>
The	O
new	O
proposal	O
calls	O
for	O
five	O
satellites	B-Application
and	O
ground	O
stations	O
providing	O
message	O
and	O
data	O
routing	O
for	O
US	O
Army	O
units	O
,	O
including	O
vehicles	O
in	O
the	O
new	O
Future	O
Combat	O
Systems	O
,	O
with	O
the	O
launch	O
of	O
the	O
first	O
satellite	B-Application
projected	O
for	O
2019	O
.	O
</s>
<s>
As	O
an	O
interim	O
replacement	O
strategy	O
,	O
Secretary	O
Gates	O
recommended	O
the	O
fielding	O
of	O
two	O
additional	O
AEHF	O
satellites	B-Application
.	O
</s>
