One of the citations on the gun sights, 2COR4:6, is an apparent reference to Second Corinthians 4:6 of the New Testament, which reads: "For God, who commanded the light to shine out of darkness, hath shined in our hearts, to give the light of the knowledge of the glory of God in the face of Jesus Christ."
Other references include citations from the books of Revelation, Matthew and John dealing with Jesus as "the light of the world." John 8:12, referred to on the gun sights as JN8:12, reads, "Whoever follows me will never walk in darkness, but will have the light of life."
Trijicon confirmed to ABCNews.com that it adds the biblical codes to the sights sold to the U.S. military. Tom Munson, director of sales and marketing for Trijicon, which is based in Wixom, Michigan, said the inscriptions "have always been there" and said there was nothing wrong or illegal with adding them.
Munson said the issue was being raised by a group that is "not Christian." The company has said the practice began under its founder, Glyn Bindon, a devout Christian from South Africa who was killed in a 2003 plane crash.
On Monday, spokespeople for the U.S. Army and the Marine Corps both told ABC News their services were unaware of the biblical markings. On Tuesday, Redfield of CentCom told ABC News that the inscriptions did not violate the directive against proselytizing. "This does not constitute proselytizing because this equipment is not issued beyond the U.S. Defense Department personnel. It's not something we're giving away to the local folks."
A photo on a Department of Defense Web site shows Iraqi soldiers being trained by U.S. troops with a rifle equipped with the bible-coded sights.
"It's wrong, it violates the Constitution, it violates a number of federal laws," said Michael "Mikey" Weinstein of the Military Religious Freedom Foundation, an advocacy group that seeks to preserve the separation of church and state in the military.
"It allows the Mujahedeen, the Taliban, al Qaeda and the insurrectionists and jihadists to claim they're being shot by Jesus rifles," he said.
Weinstein, an attorney and former Air Force officer, said many members of his group who currently serve in the military have complained about the markings on the sights. He also claims they've told him that commanders have referred to weapons with the sights as "spiritually transformed firearm[s] of Jesus Christ."
He said coded biblical inscriptions play into the hands of "those who are calling this a Crusade."