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While an important tourist attraction during the latter years of the original Star League, Communications Enterprises Inc (the sole supplier of HPG hardware and equipment for the League's Department of Communications) spent considerable money to purchase the majority of the island as a site for an upgraded replacement for the SLCOMNET's Prime HPG at the University of Terra just outside Unity City. As well as the location for the planet's massive HPG transmitter and the computer coordination systems for the entire network, the planned complex was designed to be a model Star League community, providing housing projects, a massive park, a zoo, along with library facilities, museums and tourist attractions. The central HPG complex was an architectural masterpiece of marble and ferrosteel, ensuring it was both immensely beautiful and strong enough to withstand a direct nuclear attack. 
By the time of the Amaris Coup in 2766, construction on the Hilton Head Complex was only half-completed. The bulk of the construction crews desperately fled to their homes as the coup unfolded, but those who remained carefully and methodically mothballed the remaining construction materials and equipment, hiding them from the occupying Rim Worlds Republic troops before abandoning the site. Their efforts were so successful that five weeks after the death of Richard Cameron when the 203rd Republican Guards landed on Hilton Head Island, the Republican troops found nothing of perceived value and setup camp two kilometers from the central complex, never discovering the buried materials during the length of Stefan Amaris' reign on Terra. 
In December 2779 following Operation Liberation, the SLOCOMNET's lead technician Jerome Blake visited the half-finished site to see if it was a viable location to replace the now ruined Unity City HPG station, his initial survey discovering the carefully hidden construction materials much to Blake's joy with construction beginning again within a month. As the Great Lords returned to Terra for the final session of the Star League High Council in 2780, Blake was fully involved in the continuing construction on Hilton Head, overseeing the installation of the complex's primary Fusion Reactor when he was nominated for the post of Minister of Communications on October 10th.  The island was much more than a commands center or a HPG compound; it also was full of research facilities, storage areas and computer archives. The complex was so heavily fortified than it becomes one of twenty Castle Brian on Earth. In 2819, after Jerome Blake's death, Conrad Toyama, his successor, ignored the death's last wish to be incinerated and his ashes scattered over the Court of the star League. He ordered Blake's body preserved and placed on display on Hilton Head, de facto turning the complex into a sacred place for the newborn religion.
Hilton Head has been attacked and taken only two times in all his history: the first it was in 3058, when the Word of Blake launched Operation ODYSSEUS. They succeed in take the island, but failed to stop the defenders to evacuate Primus Sharilar Mori and destroy most of the facilities. The World of Blake repaired all the damage to the complex, and built a new building: The World Cathedral, his new command center and seat of power, over the ruins of old First Circuit's building It was a beautiful building, with marble facade, columned portico and even a functional SDS system. The second and last attack was in 3077 when Task Force SICKLE, lead by Devlin Stone liberated Terra during Operation SCOUR.
It is unknown if the island was assaulted or not. In any case, at least one warhead in the fifty megaton range (or three, some say) was detonated far below the surface of the island, collapsing the tunnels and great caverns. The island's center imploded even as other weapons, conventional and strategic, blasted the surface. Hilton Head, once a landmark of beauty and power, one hundred twenty square kilometers of cultivated forests and a sprawling, modern complex, was reduced top scorched bedrock and radioactive debris. .
- ComStar", p. 9 "Hilton Head"
- ComStar", p. 9 "Hilton Head Complex - Collapse of the Star League"
- Historical Liberation of terra II p. 25
- Dawn of the Jihad Sourcebook p. 06
- Sword of Sedition p. 248