Lance corporal (LCpl) is the third enlisted rank in order of seniority in the U.S. Marine Corps, just above private first class and below corporal. It is not a non-commissioned officer rank.
The USMC is the only component of the U.S. Armed Forces to currently have lance corporals. Promotion to lance corporal is based on time in grade, time in service, and the conduct of the Marine. Further promotion to the NCO ranks (Corporal and above) is competitive and takes into account the individual service record of the marine. There can only be a certain number of corporals and sergeants in each MOS, so even with a qualifying score, promotions may be delayed due to an excessive number of corporals occupying billets in a certain MOS.
From the earliest years of the Corps, the ranks of lance corporal and lance sergeant were in common usage. Marines were appointed temporarily from the next lower rank to the higher grade but were still paid at the lower rank. As the rank structure became more firmly defined, the rank of lance sergeant fell out of use, with rank of lance corporal serving in the Corps into the 1930s, but this unofficial rank became redundant when the rank of private first class was established in 1917. The lance corporal fell out of usage prior to World War II, before it was permanently established in the sweeping rank restructuring of 1958.[6]