The sights are used by U.S. troops in Iraq and Afghanistan and in the training of Iraqi and Afghan soldiers. The maker of the sights, Trijicon, has a $660 million multi-year contract to provide up to 800,000 sights to the Marine Corps, and additional contracts to provide sights to the U.S. Army.
U.S. military rules specifically prohibit the proselytizing of any religion in Iraq or Afghanistan and were drawn up in order to prevent criticism that the U.S. was embarked on a religious 'Crusade' in its war against al Qaeda and Iraqi insurgents.
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.'
U.S. Military Weapons Inscribed With Secret 'Jesus' Bible Codes (ABC News)
Trijicon (corporate website)