Mis-quoted text, possibly propaganda? 

"In 2006, the United Nations mounted a covert operation to capture or kill Joseph Kony. A squad of U.S.-trained Guatemalan Special Ops soldiers set out into Congo's Garamba National Park, a longtime LRA refuge and the scene of the 2008–2009 Garamba offensive. Trained in jungle warfare and accustomed to surviving in the bush for long stretches, the Guatemalans were equipped with M-16s and the latest special-operations technology. Five LRA soldiers were killed and none of the Special Ops soldiers survived. According to one account, the commander of the Special Ops soldiers was beheaded. The battle, which lasted for several hours, included hand to hand combat. Reports put the U.N. dead at eight to forty. The LRA left the corpses in the jungle but took the weapons—including heavy machine guns and grenade launchers.[69]"

I removed this from the article (someone else saw that this was there, but no one deleted it). The source doesn't say anything about Guatemalan troops, or mention the battle. It's a series of six pictures with stories from individuals who were in some way affected by the LRA, but not even the word "Guatemalan" is present. Much less a description of a battle.

It read to me like it was propaganda. I guess its possible that the LRA has the internet too.