LACEY, Wash. The Department of Defense has identified three soldiers from Joint Base Lewis McChord killed in Afghanistan in what is known as a "green on blue" attack.
Sgt. Sapuro "Sapp" Nena, 25, Private First Class Genaro Bedoy, 20 and Private First Class Jon Townsend, 19, died Sunday.
All three were members of the 3rd Stryker Brigade Combat Team, 2nd Infantry Division.
Nena, 25, was originally from Honolulu. Bedoy, 20, was from Amarillo, Texas and Townsend, 19, was from Claremont, Oklahoma.
Spc. Joshua N. Nelson from Fort Gordon, Georgia, was also killed in the attack.
So far in 2012, 51 Americans have been killed by soldiers from the Afghan National Army or local police who have been trained by American soldiers.
"It is frustrating," said US Army Captain Cody Ford.
Ford did not know the three soldiers, but he can relate to them. In August, an Afghan soldier shot Ford in the leg.
Ford is home in Lacey recovering with his family.
The number of "green on blue" or "insider" attacks has nearly doubled since 2011.
As a result, NATO commanders have decided to reduce the amount of joint operations with Afghan forces.
Ford is troubled by the growing number of Americans wounded or killed by what are supposed to be their allies.
"Our main purpose over there is to do joint patrols with them to put them in the lead. That way we can home home," said Ford.