The ammunition went missing from the 1st Brigade Combat Team at Fort Bragg, said Staff Sgt. Joshua Ford.
The missing ammunition can be used in the M-4 and M-16 assault rifles.
Someone alerted Fort Bragg leadership about the missing items on Wednesday, Ford said.
After the report, the 1st Brigade team, about 3,500 people, was placed on lockdown during an initial investigation, Ford said.
The ammunition was not found and the lockdown was lifted Wednesday night.
Source: From John Branch for CNN.