LAS VEGAS -- A U.S. Marine accused of sneaking a gun and bomb-making materials through McCarran International Airport has a spotless record, according to an official at Camp Lejeune.

Lt. Phil Klay told FOX5 that Cpl. Justin Reed, currently under arrest in Boston, recently received the Marine Corp. Good Conduct Medal, given to Marines with three years of impeccable service.

Reed, 22, was stopped at Logan International Airport Sunday before boarding a flight to Charlotte, N.C., according to the Transportation Security Administration. The agency said a handgun, ammunition, and several bomb-making materials were found in his checked baggage.

The baggage had passed a security inspection at McCarran International Airport Sunday. The TSA would not comment on the incident Monday, telling FOX5 it was “under investigation.”

The agency said 100 percent of bags are screened at McCarran, so Reed’s bags should have been scanned.

Reed is from Missouri and joined the Marines in 2005. He is assigned to infantry but has not served in Iraq or Afghanistan. In addition to the Good Conduct Medal, Reed has also been awarded the Global War on Terrorism Medal and the National Defense Service Medal.

Klay said Reed had recently been instructing fellow Marines in California, and it is unknown why he was flying out of Las Vegas. It is also unknown whether Reed was wearing his uniform at McCarran Airport. Military officials are conducting their own investigation, and could file additional charges.

Reed is charged with possession of a concealed weapon and possession of an infernal machine. The Boston Globe reported a list of the items allegedly found in Reed’s bags. Among them:

a locked handgun box containing a semiautomatic handgun

a fully loaded gun magazine

several boxes of 9 mm and 7.62 mm ammunition

three model rocket engines containing an explosive mixture

military pull-type fuses and switches

electronics kit boxes with various components

a hand grenade fuse assembly with detonator