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COMMANDER FLEET ACTIVITIES CHINHAE

also known as CFAC · Fleet Activities Chinhae · U.S. Naval Forces Korea — Chinhae · CFA Chinhae

The U.S. Navy's only base on the Korean peninsula — a 75-year partnership with the ROK Navy.

Overseas installation. This is a forward-deployed U.S. Navy base in South Korea, operating under the host-nation Status of Forces framework summarized below. Travel, base access, command sponsorship, and entry requirements are subject to current orders and host-nation policy — always verify with your command and the installation's official public-affairs office before traveling or visiting.
Established
1946
Type
Naval Support Activity
Location
Jinhae-gu, Changwon, South Korea
Country
South Korea
Region
PACOM
Timezone
Asia/Seoul
Coordinates
35.145°, 128.648°
Major Commands
6
Area
Approximately 100 acres of U.S. footprint on the ROK Navy Jinhae base
Personnel
Approximately 350 U.S. military and civilian personnel and family members

OVERVIEW

Commander Fleet Activities Chinhae is the United States Navy's only installation on the Korean peninsula — a small forward-operating enclave aboard the Republic of Korea Navy's headquarters base at Jinhae, on the south-central coast of South Korea. The U.S. Navy footprint comprises approximately 100 acres within the much larger ROK Navy installation, which also hosts the ROK Naval Academy, ROK Fleet Headquarters, and the ROK Navy's principal southern repair and logistics complex.

CFAC supports U.S. naval forces operating across the Korea Strait and the East China Sea, hosting forward elements of Commander, U.S. Naval Forces Korea (CNFK), Naval Special Warfare Unit One, a Mobile Diving and Salvage Unit detachment, and a small munitions and logistics support footprint. Approximately 350 U.S. military and civilian personnel and family members are assigned to the base, making CFAC the smallest stand-alone U.S. Navy installation overseas.

The base's strategic value lies in its partnership rather than its size. Chinhae sits 50 km west of the major port of Busan and roughly 200 km south of the Korean Demilitarized Zone — far enough south to be outside the immediate North Korean artillery threat that overhangs Seoul, but close enough to support ROK and combined naval operations across the peninsula. The base is the principal node for daily U.S.–ROK Navy interaction and for combined exercises and contingency planning at the working level.

KEY FACTS

  • Only U.S. Navy Base in KoreaThe U.S. Navy's only installation on the Korean peninsula and the smallest stand-alone U.S. Navy base overseas
  • ROK Navy TenantA U.S. Navy enclave aboard the Republic of Korea Navy headquarters base at Jinhae — alongside the ROK Navy Academy and Fleet Headquarters
  • Special Operations Forward HubForward operating site for U.S. Naval Special Warfare and explosive ordnance disposal forces supporting U.S. Forces Korea
  • Strategic PositionSouthern coast of Korea on the Korea Strait, 50 km west of Busan and 200 km from the DMZ — protected fleet anchorage outside the immediate North Korean artillery threat
  • Historic ContinuityEstablished by the U.S. Navy in 1946 immediately after the Korean liberation — one of the oldest continuously operated U.S. Navy installations in Asia

HISTORY

Chinhae (진해, romanized today as Jinhae) has been a major naval base since the early 20th century. The Imperial Japanese Navy seized and developed the deepwater harbor in 1910 after annexing Korea, building it into one of the IJN's principal forward bases on the Asian mainland. The IJN's Chinkai Guard District operated from the harbor through World War II, and Chinhae served as a major supply, training, and repair port for Japanese fleet operations across the Yellow Sea and the Korea Strait.

Following Japan's surrender in August 1945 and the Allied liberation of Korea, U.S. military forces took control of the former Japanese facilities. The United States Navy formally established Fleet Activities Chinhae in 1946 as a small support installation for the U.S. Navy's reconstitution mission in southern Korea. When the Korean War broke out in June 1950, Chinhae's strategic significance jumped dramatically — the deep harbor on Korea's southern coast became a critical U.S. and United Nations naval logistics, repair, and amphibious staging port. Throughout 1950–1953, U.S., ROK, and other allied warships used Chinhae for refueling, rearming, and combat repair, and the base supported operations from the Inchon landing through the final armistice.

After the 1953 armistice, Chinhae's role evolved into a permanent forward enclave under the U.S.–ROK Mutual Defense Treaty signed that same year. Through the 1960s and 1970s, the U.S. Navy maintained a small support staff at Chinhae focused on logistics, naval intelligence, and bilateral coordination with the rapidly modernizing Republic of Korea Navy, which made Jinhae its national headquarters and academy site. The bilateral U.S.–ROK Status of Forces Agreement, signed in 1966, formalized the legal status of U.S. forces in Korea including those at Chinhae.

The post–Cold War decades saw Chinhae's mission shift toward special operations, explosive ordnance disposal, and combined exercises. Naval Special Warfare Unit One (NSWU-1) — a forward element of Naval Special Warfare Group ONE — established a forward detachment at Chinhae to conduct combined training with ROK Navy Underwater Demolition Team (UDT/SEAL) units, and Mobile Diving and Salvage Unit One (MDSU-1) detachments routinely deployed to the base for exercises and contingency response. After the March 2010 sinking of the ROK corvette Cheonan, U.S. and ROK Navy forces operating in part from Chinhae conducted the joint investigation and elevated alert posture.

Today CFA Chinhae remains a small but operationally significant U.S. Navy enclave — the only U.S. Navy base on the Korean peninsula and the daily working-level node of the U.S.–ROK naval alliance. The base hosts the annual Cherry Blossom Festival on its grounds in the spring, opening to local Korean residents and U.S. families, and continues to support combined U.S.–ROK exercises including Foal Eagle, Ulchi Freedom Shield, and routine bilateral mine countermeasures, salvage, and special operations training.

MAJOR COMMANDS & TENANT UNITS

  • Commander, Fleet Activities Chinhae (CFAC)
  • Commander, U.S. Naval Forces Korea (CNFK) — forward element
  • Naval Special Warfare Unit One (NSWU-1) — forward element
  • Mobile Diving and Salvage Unit One (MDSU-1) detachment
  • Naval Munitions Command East Asia Division Detachment Chinhae
  • Republic of Korea Navy Headquarters (host)

LOCATION & GEOGRAPHY

Commander Fleet Activities Chinhae — Highlighted on world map
Commander Fleet Activities Chinhae
Address
Jinhae-gu, Changwon, South Korea
35.1450° N, 128.6483° E
View on Google Maps
Region
U.S. Indo-Pacific Command (PACOM)
Jinhae harbor — Jinhae-gu, Changwon, South Gyeongsang Province, South Korea

HOST NATION CONTEXT

Host Nation
South Korea
Combatant Command
U.S. Indo-Pacific Command (PACOM)
Timezone
Asia/Seoul
Currency
KRW
Languages
KO · EN
Command Sponsorship
Required for dependents
Passport
Required for entry
Status of Forces Agreement

U.S.–Republic of Korea Status of Forces Agreement (1966, revised 2001). Status governed by the U.S.–ROK Mutual Defense Treaty (1953). CFAC is a U.S. Navy tenant within the Republic of Korea Navy's Jinhae naval base.

CFA Chinhae operates under the U.S.–Republic of Korea Mutual Defense Treaty (signed 1953) and the bilateral U.S.–ROK Status of Forces Agreement (signed 1966, comprehensively revised in 2001). As a U.S. Navy tenant aboard the Republic of Korea Navy's headquarters base, all U.S. operations are closely coordinated with the ROK Navy commander of Jinhae base and with ROK Fleet Headquarters.

The U.S.–ROK alliance is one of the United States' deepest bilateral security relationships, encompassing roughly 28,500 U.S. troops across the peninsula under U.S. Forces Korea. The bulk of the U.S. presence is U.S. Army (Eighth Army at Camp Humphreys) and U.S. Air Force (7th Air Force at Osan and Kunsan); CFA Chinhae provides the U.S. Navy's only on-peninsula working-level node. The Republic of Korea provides substantial Host Nation Support funding under the bilateral Special Measures Agreement, helping cover labor, utility, and facility costs across the U.S. presence.

U.S. military personnel and SOFA-status family members enter the Republic of Korea with no-fee passports and a Korean SOFA stamp; civilian visitors hold standard Korean tourist visas or visa-waiver entries and must be sponsored for base access. The local language is Korean; English-speaking ROK Navy personnel are present throughout the host installation, but daily life off-base requires basic Korean familiarity.

⚠ Always verify SOFA status, command sponsorship, and entry requirements with your command and the installation's official public-affairs office before traveling.

NOTABLE EVENTS

  1. 1946
    U.S. Navy Establishment
    United States Navy establishes Fleet Activities Chinhae shortly after the Allied liberation of Korea, taking over a former Imperial Japanese Navy facility on the southern Korean coast.
  2. 1950
    Korean War Logistics
    Throughout the Korean War (1950–1953), Chinhae serves as a U.S. and U.N. naval logistics, repair, and amphibious staging port supporting operations across the peninsula.
  3. 1953
    U.S.–ROK Mutual Defense Treaty
    Signing of the U.S.–Republic of Korea Mutual Defense Treaty establishes the legal foundation for permanent U.S. military presence in Korea, including the U.S. Navy enclave at Chinhae.
  4. 1966
    U.S.–ROK SOFA
    Bilateral Status of Forces Agreement signed, governing the legal status of U.S. forces in Korea including those assigned to CFA Chinhae.
  5. 2010
    Cheonan Response
    Following the sinking of the ROK corvette Cheonan in March 2010, U.S. and ROK Navy forces operating from Chinhae and other Korean ports conduct the joint investigation and elevated alert posture.

NEARBY BASES

NEARBY · JP
Fleet Activities Sasebo
NEARBY · JP
Naval Station Yokosuka

FREQUENTLY ASKED QUESTIONS

CFA Chinhae is in the Jinhae-gu district of Changwon city, on the south-central coast of South Korea in South Gyeongsang Province. The U.S. enclave sits aboard the much larger Republic of Korea Navy headquarters base, about 50 km west of Busan and 200 km south of the Korean DMZ.

The U.S. Navy footprint covers approximately 100 acres within the larger ROK Navy installation. Approximately 350 U.S. military and civilian personnel and family members are assigned, making CFAC the smallest stand-alone U.S. Navy base overseas.

The U.S. military presence in Korea is overwhelmingly Army (Eighth Army at Camp Humphreys) and Air Force (7th Air Force at Osan and Kunsan). The U.S. Navy's contribution to the U.S.–ROK alliance is provided primarily by the 7th Fleet, headquartered at Yokosuka, which deploys ships to Korean waters as needed. CFA Chinhae provides only the daily working-level liaison, logistics, and special operations forward presence the alliance requires on the peninsula itself.

CFAC hosts forward elements of Commander, U.S. Naval Forces Korea (CNFK), Naval Special Warfare Unit One, a Mobile Diving and Salvage Unit detachment, a Naval Munitions Command detachment, and the U.S. Navy base support staff. The host installation is the headquarters of the Republic of Korea Navy and the ROK Naval Academy.

CFAC is a U.S. Navy tenant unit aboard a Republic of Korea Navy installation rather than a formal joint base. The ROK Navy retains overall command of the installation, and U.S. and ROK forces work together daily under the bilateral Status of Forces Agreement and the Mutual Defense Treaty.

Chinhae sits about 200 km south of the Korean DMZ and the Seoul metropolitan area, putting it well outside the immediate range of the bulk of North Korean forward-deployed artillery. Like all U.S. bases in Korea, the installation operates under U.S. Forces Korea force protection conditions and contingency plans.

Yes. Family members accompanying service members on PCS orders to CFA Chinhae must be command-sponsored, with a no-fee passport and Korean SOFA stamp. The base is small and on-base housing is limited; many families live in nearby Changwon and Jinhae under the bilateral SOFA framework.

SOURCES

Last updated 2026-05-02
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