My name is Khalid,” he tells me, and I want to believe him. After all, he has traveled the world as royalty—the son of the king of Saudi Arabia, no less. Leading international investors know him as His Royal Highness Khalid bin al-Saud. He moved in an entourage of Rolls-Royces and Ferraris, his every whim tended to by uniformed housekeepers and armed bodyguards. A suave British-born C.E.O. handled his business affairs, and a well-connected international banker marketed his investment deals to a select few, leaving him to live a life of astonishing excess.

Ever since he was a boy, he had been pitted against his royal brothers in an expensive game—to see who could “outdo the other one” in spending, he liked to say. Khalid was surely winning. He was in negotiations to purchase 30 percent of the famed Fontainebleau hotel in Miami Beach for $440 million, and he was selling early access to what promised to be the biggest I.P.O. in history: the initial public offering of Aramco, the Saudi oil giant. Until last June, when the Saudi government shelved the plan, the I.P.O. was expected to be worth more than $2 trillion.

Khalid could regularly be overheard talking on his phone with the likes of Bill Gates and Presidents Barack Obama and Bill Clinton. “I’m sick and tired of Trump calling me and inviting me to the White House!” he often complained. He kept in touch with his father, the Saudi king, on FaceTime, and, if you were lucky, he would let you listen in. But the prince’s favorite companion was Foxy, his beloved Chihuahua, whom he draped in diamonds and designer dog clothes and toted around in a $2,690 Louis Vuitton dog carrier. He stuffed other Louis Vuitton bags with stacks of $100 bills, tossing the money from his jewel-encrusted fingers, one sporting a nine-carat diamond, to those who tended to his needs—flashes of benevolence from an academic genius whose LinkedIn page lists his law studies at Harvard, his master’s in business administration from the University of Southern California, and his top marks at Institut Le Rosey, the elite Swiss boarding school attended by Rockefellers and Rothschilds.

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Last month, a U.S. Africa Command spokesperson confirmed in a Task & Purpose report that Marine Corps Raiders were involved in a fierce battle in 2017 in an unnamed North African country, where they fought beside partner forces against militants of Al Qaeda in the Islamic Maghreb (AQIM). AFRICOM acknowledged that two Marines received citations for valor but withheld certain details, such as the location—undisclosed due to “classification considerations, force protection, and diplomatic sensitivities.” The command also said the Marine Special Operations unit was engaged while on a three-day train, advise and assist operation. However, subsequent research and analysis strongly suggest U.S. involvement runs much deeper. In fact, the dramatic events described in the award citations obtained by Task & Purpose align with those that took place in Tunisia, which has been combatting a low-level insurgency in its western borderlands for the past seven years. Evidence indicates the battle occurred at Mount Semmama, a mountain range in the Kasserine governorate, near the Algerian border. There, the United States sustained its first casualty in action in Tunisia since World War II.

While not of the same magnitude, the events that AFRICOM confirmed took place on Feb. 28, 2017, echo a disastrous ambush less than seven months later in the village of  Tongo Tongo , Niger. In that battle, members of the Islamic State in the Greater Sahara killed four Army Special Forces soldiers and four Nigerien partners. U.S. partner forces engaged militants of AQIM’s Tunisian branch, the Uqba ibn Nafaa Battalion (KUBN) in a firefight, which resulted in the killing of one militant. The engagement also necessitated a request for air support to rout the militants. The jihadis then attempted to flank the joint U.S.-Tunisian force from the rear, forcing the Marines to return fire. While engaged on the ground, U.S. forces were also part of the air-support component. When a Tunisian soldier manning an M60 machine gun aboard a helicopter sustained wounds after being shot twice by militants returning accurate fire, a U.S. Marine Raider took control of the machine gun to maintain suppressive fire against the militants and simultaneously treated the wounded Tunisian soldier. The Marine Raider unit and their Tunisian partner force each sustained one casualty in the battle, both of whom recovered from their wounds. At the time,  local  media  reported the incident without alluding to any U.S. participation.

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