ALTERNATE - Lima Site 98 (LS 98) or Lima Site 20A (LS 20A)
https://en.wikipedia.org/wiki/Long_Tieng
https://military.wikia.org/wiki/Long_Tieng
Long Tieng was often described as “The Most Secret Place on Earth”
“What a place is Long Tieng,” said USAID officer Jim Schill. “Tribal soldiers dressed in military garb standing next to traditionally dressed Hmong, with Thai mercenaries milling about. And the Americans here are mostly CIA operatives with goofy code names like Hog, Mr. Clean, and Junkyard. The town itself is not much. There’s one paved road running through it and tin shacks on either side with eating shops, food stalls, and living quarters.”
During the Secret War, Long Tieng became the largest Hmong settlement in the world. In the words of one author, Long Tieng "became a desultory metropolis, an unpaved, sewer less city of 30,000+ where Hmong ran noodle stands, cobbled shoes, tailored clothes, repaired radios, ran military-jeep taxi services, and interpreted for American pilots and relief workers."
Introduction
Long Tieng (also spelled Long Chieng, Long Cheng, or Long Chen)
It was located in a valley at 3,100 feet elevation, high enough to have chilly nights and cold fogs. It was surrounded by mountains, and on the northwest side of the runway were karst outcrops several hundred feet high. In the shadow of the Karst outcrops was "Sky" the Central Intelligence Agency (CIA) headquarters in Long Tieng.
[https://en.wikipedia.org/wiki/Long_Tieng]
It was referred to as Lima Site 98 (LS 98) or Lima Site 20A (LS 20A).
The unofficial name used by the Agency was ALTERNATE, a purposely vague name that would not raise suspicions.
That is also why CIA case officers would say the “Agency” or working for the “Company”
So someone could say I was traveling to ALTERNATE and not give away that you're traveling to a top secret Central Intelligence Agency (CIA) base in Laos.
Long Tieng Laos - CIA base -grjenkin, CC BY 2.0 <https://creativecommons.org/licenses/by/2.0>, via Wikimedia Commons
At the height of its significance in the late 1960s, the "secret city" of Long Tieng maintained a population of 40,000 inhabitants, making it the second-largest city in Laos at the time, although it never appeared on maps throughout this period.
In 1962 the CIA first set up a headquarters for Major General Vang Pao in the Long Tieng valley, which at that time had almost no inhabitants. By 1964 a 1260 m runway had been completed and by 1966 Long Cheng was one of the largest US installations on foreign soil, becoming one of the busiest airports in the world.
[https://en.wikipedia.org/wiki/Long_Tieng]
The CIA bar on base had two Himalayan beer addicted bears, with the cages attached to said bar. Many visitors would be entertained by these bears, and these animals became legends.
Major General Vang Pao was known all over the Kingdom of Laos as VP and made his base there at Long Tieng.
Summary
The most secret base in Laos.
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Central Intelligence Agency (CIA)