The mission of the NNSC is to carry out inspections and investigations to ensure implementation of sub-paragraphs 13(c) and 13(d) of the Armistice, which prevent reinforcements being brought into Korea, either additional military personnel or new weapons, other than the piece-for-piece replacement of damaged or worn out equipment.

The Swiss and Swedish teams were of a small size, relying on their hosts to provide personnel support, vehicles, and communication equipment to report back to the Supervisory Commission.

The Czechoslovak and Polish teams were much larger and fully self-sufficient, including heavy radio trucks, interpreters, cooks and mess equipment.

From this time onward, NNSC activities were limited to recording information offered by both sides, and staffing levels were reduced.

[6]From June 1956 to 1993, the NNSC ceased their controls but solely forwarded the war parties' reports on entering and leaving military persons to the UNCMAC.

Camps for the Swedish and Swiss members and their staffs are located in the southern half of the Korean Demilitarized Zone (DMZ) adjacent to the JSA.

The former Polish and Czech camps which were located nearby on the north Korean side of the Military Demarcation Line, have been taken over by the KPA and are now used for other purposes.

[14][15] The Swedish and Swiss delegations continue to submit reports on South Korean troop movements to North Korea, which are ignored.

[19] Occasionally, Polish delegates attend the meetings at Panmunjom, but through South Korea, as Poland has changed sides politically.

On occasion, the NNSC participates in UNC Military Armistice Commission investigations, such as into South Korea's actions during naval skirmishes.

[16] Poland continues to send representatives to commission meetings twice a year, which the NNSC regards as legitimizing its position with 75% of the original delegations intact.

[24] On 1 August 1953, the first Swiss NNSC delegation, consisting of 96 members, arrived,[25][26] expanding to about 150 within a few months to assist with monitoring, according to a Stars and Stripes report.

[28] Introductory text from the book covering history of Czechoslovak-North Korean relations and the beginning of NNSC is available online [29] Later, the size of Czechoslovak contingent became significantly smaller.

In 2013, on the occasion of the 60th anniversary of signing of the armistice, the Embassy of the Czech Republic in South Korea organized a series of events to commemorate Czechoslovak participation in the NNSC.

[30] The first shift of the Polish contingent consisted of 301 individuals and began its operations on August 1, 1953, with General Mieczysław Wągrowski as its commander.

This decision was influenced by the provisions of the Armistice Agreement and international commitments undertaken by Warsaw – without Poland's participation, the NNSC would lose its purpose.