Bas 60 (Flygbassystem 60, Air Base System 60) was an air base system developed and used by the Swedish Air Force during the Cold War. The system was based around defensive force dispersal of aircraft and its supporting ground operations across many krigsflygbaser (wartime air bases) in case of war, primarily as a protective measure against nuclear weapons. The purpose of the system was to make it complicated for an opponent to destroy the Swedish Air Force on the ground and thus ensure endurance for the air force in a conflict scenario. The plan was to disperse the air units so one krigsflygbas would house one squadron (8-12 aircraft). This dispersion principle also applied to the individual wartime bases themselves, meaning that the various functions of an air base were spread over a large area in and around the base.

The system originated from an air force inquiry in 1954 and was formally implemented in the 1958 defence plan. The original plan called for 70 wartime air bases to be built, with 46 of them to be equipped for continuous usage. The number of bases was however reduced with every revision of the plan and about 40 bases ended up being completed.

During peace time the air squadrons were stationed at their respective air wing and deployment to the wartime air bases would only occur when the threat level increased. But many of the air wings also doubled as wartime air bases. The wartime air bases were only manned by a smaller bastropp (base troop) during peace time and the full base battalion would only be manned with a mobilization (except during certain exercises). This was because the majority of the units were made up by conscripts. The base system was therefore never fully active during the time it existed, like the rest of the Swedish Armed Forces during the Cold War.

A wartime air base in the Bas 60 system functioned as ordinarie bas (regular base), shortened as "O-bas" (R-base), for one or more type of aircraft; fighter, attack or reconnaissance. A regular base had the personnel and resources needed for maintaining and repairing the type of aircraft assigned to that base. Some bases also doubled as temporär bas (temporary base), shortened as "T-bas" (T-base), for one or more aircraft types. A temporary base only had capacity to refuel and rearm the type of aircraft it acted as temporary base for. All regular bases acted as temporary bases for fighter aircraft.

Road runways were also built to complement the wartime bases, acting as a backup bases. Civilian airports could also be used as a backup alternative.

The system was further developed into Bas 90 during the 1970s and 1980s.

To complement the ordinary Bas 60 bases, reservvägbaser (road runways) were built to act as a backup alternative. Selected sections of public roads that were suitable for the purpose were widened to give enough space for aircraft to take-off and land. The typical dimensions for a reservvägbas (road runway) was 1,500–2,000 metres (4,900–6,600 ft) in length and 12 metres (39 ft) in width. One or two runway aprons were built near each end of the runway. About 30 road runways were built, primarily in the southern and eastern parts of Sweden. Usage of the road runways were limited by adverse light and weather conditions, which is why they were primarily considered a backup alternative. Utilizing a road runway required relocating units and resources from an ordinary base, and certain field works around the runway were often necessary before it could be used.

Selected civilian airports were later added as additional reserve bases.

One base was operated by a basbataljon 60 (base battalion type 60), with the battalion chief in charge of the overall operations on the base. A fully mobilized battalion consisted of 1200-1500 men, but in peace time a base was normally operated by 2-3 technical officers and 10-15 conscripted flight mechanics. During larger exercises all or part of the full base battalion would be called in.

One base battalion consisted of the following units:

• Stabskompani (command company): command and administration of the base.
• Stationskompani (station company): aircraft groundcrew and maintenance.
• Intendenturkompani (commissariat company): supply and logistics.
• Flygfältsarbetskompani (field works company): base infrastructure repair and maintenance.
• Skyddskompani (security company): base security, removal of unexploded ordnance and fire fighting.
• Sjukvårdspluton (medical platoon): first aid and medical care.

The defense of the base could also be reinforced with infantry and anti-air units from the Swedish Army.

In the 1970s and 1980s the Bas 60 system was developed into Bas 90 to accommodate new needs and threats.

With the end of the cold war the Bas 60 and Bas 90 system was scrapped, and many of the wartime air bases have been demilitarized and sold to civilian owners.

Revinge

Jämjö

Hallabro

Hovmantorp

Tokebo

Målerås

Lammhult

Falkenberg

Follingbo

Bro

Hjo

Klockrike

Tillinge

Heby

Åland

Björklinge

Gimo

Gysinge

Skärplinge

Älvkarleby

Mokorset

Norrala

Jämtkrogen

Överhörnäs

Bjurholm

Finnträsk

Långträsk

Vidsel

Jokkmokk

Road runways in the Bas 60 system. Not to be confused with the short runways in the Bas 90 system, which in many cases also were built on public road.

The Bas 60 road runways are not to be confused with the short runways in the Bas 90 system, which in many cases also were built on public road. The Bas 90 short runways belonged to a larger air base and were therefore not counted as individual bases, unlike the Bas 60 road runways.