I didn't know, and I pay attention to stuff like this.

Three United States Army Special Forces were killed and two were wounded on Wednesday in an ambush in Niger while on a routine patrol with troops they were training from that nation in northwestern Africa, American military officials said.
“We can confirm reports that a joint U.S. and Nigerien patrol came under hostile fire in southwest Niger,” Lt. Cmdr. Anthony Falvo, a spokesman for the United States Africa Command in Stuttgart, Germany, said in an email.
A United States military official said that three Army Green Berets were killed in the attack, which took place 120 miles north of Niamey, the capital of Niger, near the border with Mali, where militants with Al Qaeda in the Islamic Maghreb, an affiliate of Al Qaeda, have conducted cross-border raids. Two other Green Berets were wounded, another military official said. Niger’s troops were also believed to have suffered casualties, but details were not immediately known.
...
In his first eight months in office, Mr. Trump’s top military officials have shown few signs that they want to back away from President Barack Obama’s strategy to train, equip and otherwise support indigenous armies and security forces to fight their own wars instead of deploying large American forces to far-flung hot spots, including the Sahel, a vast area on the southern flank of the Sahara that stretches from Senegal to Sudan.

Yes, good thing that we aren't deploying American forces to far-flung hot spots like Niger.
Niger isn't the only African country that our soldiers being killed.

In May, a member of the Navy SEALs was killed and two other American service members were wounded in a raid in Somalia, the first American combat fatality there since the 1993 “Black Hawk Down” battle.