Jungle warfare
Much British strategic thinking on counterinsurgency tactics in a jungle environment was passed on through BRIAM (British Advisory Mission) to South Vietnam headed by Sir Robert Thompson, a former Chindit and the Permanent Secretary of Defense for Malaya during the Emergency.
The Americans further refined jungle warfare by the creation of such dedicated counterinsurgency special operations troops as the Special Forces (Green Berets), Rangers, Long Range Reconnaissance Patrols (LRRP), and Combat Tracker Teams (CTT).
During the decade of active U.S. combat involvement in the Vietnam War (1962–1972), jungle warfare became closely associated with counter insurgency and special operations troops.
However, although the American forces managed to have mastered jungle warfare at a tactical level in Vietnam, they were unable to install a successful strategic program in winning a jungle-based guerrilla war. Hence, the American military lost the political war in Vietnam for failing to destroy the logistics bases of the Viet Cong and the Vietnamese People's Army along the Ho Chi Minh Trail.
With the end of the Vietnam War, jungle warfare fell into disfavor among the major armies in the world, namely, those of the U.S.-led NATO and the Soviet-led Warsaw Pact, which focused their attention to conventional warfare with a nuclear flavor that was to be fought on the jungleless European battlefields.
American special operations troops that were created for the purpose of fighting in the jungle environment, such as LRRP and CTT, were disbanded, and other jungle-warfare-proficient troops, such as the Special Forces and Rangers, went through a temporary period of decline until they found their role in counterterrorism operations in the 1980s.

Central American Crisis: 

Post-Cold War: The end of the Soviet Union in the early 1990s marked the beginning of the end of a number of proxy wars that had been fought between the superpowers in the jungles of Africa, South America, and Southeast Asia. In the euphoria at the end of the Cold War, many Western nations were quick to claim the peace dividend and reinvested resources to other priorities.
Jungle warfare was reduced in scope and priority in the regular training curriculum of most conventional Western armies. The nature of major military operations in the Middle East and Central Asia saw the need to put an emphasis upon desert warfare and urban warfare training in both the conventional and the unconventional warfare models.

Conflicts in Colombia, Ecuador, and Peru: 

Chittagong Hill Tracts: 

Jungle units and training schools: The following military and police forces have specialized units that are trained and equipped to conduct jungle warfare:

 Argentina: the Argentine Army has four companies of Cazadores de Monte (Jungle Hunters).
 Brazil: the Brazilian Army has six Jungle Infantry Brigades: 1st, 2nd, 16th, 17th, 22nd and 23rd Jungle Infantry Brigades and others units, and the Jungle Warfare Training Center (CIGS). Brazilian Special Forces, Commandos, Parachute Infantry and Marine Corps are trained in jungle warfare too. The SOF of some State Military Police Forces, like the Military Police of São Paulo's Comandos e Operações Especiais, the Military Police of Minas Gerais's Batalhão de Operações Especiais (BOPE)/COMAF, the Military Police of Rio de Janeiro's Batalhão de Operações Policiais Especiais (which has an agreement with the CIGS) and the Military Police of Maranhão's Companhia de Operações de Sobrevivência em Área Rural (COSAR) has training or are specialized in jungle operations. Jungle artillery is made by the 1st and the 10th Jungle Field Artillery Group.
 Brunei:
Royal Brunei Armed Forces (RBAF)
Royal Brunei Land Force (RBLF)
Gurkha Reserve Unit (GRU)
Royal Brunei Land Force Regiment (RBLFR)
Royal Brunei Navy (RBN)
Naval Surface Action Group (NSAG)
Royal Brunei Air Force (RBAF)
No. 236 Squadron
Parachute Airborne Tactical Delivery Unit (PATDU)
Royal Brunei Police Force (RBPF)
Special Operations Squad (PGK)
 Cambodia:
Royal Cambodian Armed Forces (RCAF)
Royal Cambodian Army
911th Special Forces Regiment
B-70
All infantry divisions and mechanized infantry brigade can fight in the jungle.
Royal Cambodian Navy
Naval Infantry Company
Royal Gendarmerie
Infantry Battalion
 Colombia: Brigada de Fuerzas Especiales, Batallones de Selva.
 Ecuador: the Ecuadorian Army maintains three units composed of jungle troops: the 17th, 19th and 21st Jungle Infantry Brigades (Brigadas de Infantería de Selva). In addition, it has an independent jungle battalion with personnel recruited from the native population of the jungle: the 23rd Special Operations Training Battalion (Batallón Escuela de Operaciones Especiales 23, or BEOES 23). It has also a training school for jungle operations, the Escuela de Selva "Cap. Giovanny Calles".
 Indonesia:
Indonesian Army
Combat Reconnaissance Platoon (Tontaipur) are Kostrad's special unit which expertise in Reconnaissance operations, it is trained in jungle warfare in accordance with the terrain of the tropical country.
 India:
The Indian Army maintains an elite Counter Insurgency and Jungle Warfare School which is used to train domestic and foreign units in methods for countering irregular warfare.
 Malaysia
Ministry of Natural Resources and Environmental Sustainability (MPRT)
Forestry Department of Peninsular Malaysia
Forest Ranger
Malaysian Armed Forces (MAF)
Malaysian Army
10th Parachute Brigade (10 PARA BDE)
21st Special Service Group (GGK)
Border Regiment
Royal Armoured Corps (KAD)
Royal Malay Regiment
Royal Ranger Regiment (RRD)
Territorial Army Regiment
Royal Malaysian Navy (RMN)
PASKAL
Royal Malaysian Air Force (RMAF)
Royal Malaysian Air Force Regiment (RMAFR)
HANDAU
Infantry Security Group
PASKAU
Malaysian Maritime Enforcement Agency (MMEA)
Special Task and Rescue (STAR)
Royal Malaysia Police (RMP)
General Operations Force
Special Operations Command (PGK)
Special Actions Unit (UTK)
VAT 69 Commando (VAT 69)
UNGERIN
 Myanmar:
Tatmadaw
Myanmar Army
Airborne Infantry Division (AID)
Armoured Infantry Battalions (AIB)
Border Guard Forces (BGF)
Light Infantry Divisions (LID)
Special Forces Brigade (SFB)
Myanmar Navy
Myanmar Navy SEALs
Naval Infantry Battalion (NIB)
Myanmar Police Force
Border Guard Police (BGP)
Combat Police Battalions (SWAT)
Forestry Security Police Force
 Philippines
Armed Forces of the Philippines (AFP)
Philippine Army (PA)
All infantry divisions, armor division and combined arms brigade can fight in the jungle.
Light Reaction Regiment (LRR)
Scout Ranger
Special Forces Regiment (Airborne)
Philippine Navy (PN)
Naval Special Operations Command (NAVSOCOM)
Philippine Marine Corps (PMC)
Force Reconnaissance Group (FRG)
Marine Brigades
Marine Rifle Battalions (MRB)
Marine Security and Escort Group (MSEG)
Marine Scout Snipers (MSS)
Philippine Air Force (PAF)
710th Special Operations Wing (710th SPOW)
Department of Environment and Natural Resources (DENR)
Park Ranger
Philippine National Police (PNP)
Regional Mobile Force Battalion (RMFB)
Special Action Force (SAF)
 Thailand
Ministry of Interior (MOI)
Department of Provincial Administration (DOPA)
Volunteer Defense Corps (VDC)
Ministry of Natural Resources and Environment (MNRE)
Royal Forest Department (RFD)
Forest Ranger
Park Ranger
Small Ranger Unit (SRU)
Royal Thai Armed Forces (RTARF)
Royal Thai Army (RTA)
31st Infantry Regiment, King Bhumibol's Guard
All infantry, cavalry, and mechanized infantry divisions can fight in the jungle.
Long Range Reconnaissance Patrols Company (LRRP)
Royal Thai Army Special Warfare Command (RTASWC)
Thahan Phran
Royal Thai Navy (RTN)
Mekong Riverine Unit (MRU)
Royal Thai Marine Corps (RTMC)
Marine Division
1st Marine Regiment
2nd Marine Regiment
3rd Marine Regiment
Marine Task Forces (MTF)
Marine 61st Special Operations Center
Marines Task Unit 411
Paramilitary Marine Regiment
RECON
Royal Thai Navy SEALs
Royal Thai Air Force (RTAF)
RTAF Security Force Command
Special Operations Regiment (SOR)
Royal Thai Police (RTP)
Border Patrol Police (BPP)
Aerial Reinforcement Division (ARD) aka Police Aerial Reinforcement Unit (PARU)
Naresuan 261
Special Forces Company (SFC)
All Border Patrol Police Regional Divisions can fight in the jungle.
Special unit Border Patrol Police Regional Divisions
4th Border Patrol Police Regional Divisions
43th Border Patrol Police Sub-Division
SINGA Special Operations Team
44th Border Patrol Police Sub-Division
Long Range Surveillance Unit (LRSU)
 United States: The U.S. Army 25th Infantry Division is the primary jungle warfare unit in its size.