Question: On which date did the 56th Guards Air Assault Brigade secure the major mountain pass connecting northern Afghanistan with Parwan Province?
Context: 216 Parachute Signal Squadron (216 Para Sig or simply, 216) is a Squadron of the British Army's Royal Corps of Signals.  It is responsible for installing, maintaining and operating all types of telecommunications equipment and information systems in support of 16 Air Assault Brigade.  The 216 Parachute Signal Squadron are capable of delivering Aerial Support (AS) to the 16 Air Assault Brigade.  They can use parachute training and parachute capability (also they are trained in altitude negotiation- how to react to a situation at a certain height) as tactical measures to get to where they are needed if the 16 Air Assault Brigade need them in hills, rocky and/ or dangerous terrain that cannot be negotiated on foot or by vehicle. The 45th Air Assault Brigade is a brigade of the Ukrainian Airmobile Forces, formed twice.  The brigade was first formed in 1993 from elements of the 299th Guards Airborne Regiment of the 98th Guards Airborne Division.  Part of the 1st Airmobile Division, the brigade was disbanded.  The brigade was reformed from an airmobile battalion in 2016. The brigade traces itself back to the formation of the 65th Separate Air Assault Battalion in Białogard from the 126th Separate Guards Reconnaissance Battalion of the 6th Guards Motor Rifle Division in November 1985, part of the Northern Group of Forces.  Between May and November 1986, the battalion was expanded to form the 83rd Separate Air Assault Brigade under the command of Colonel V.M. Sinitsyn.  The brigade participated in the "Druzhba-86" exercises of Warsaw Pact troops.  In 1988, after Soviet Ministry of Defense inspections, the brigade had the best results out of the Northern Group of Forces.  The brigade won a Krasnaya Zvezda contest involving a 10 kilometer forced march in 1989.  On 18 May 1990, the brigade was subordinated directly to the commander of the Soviet airborne and was reorganized as the 83rd Separate Airborne Brigade.  The brigade was transferred to Ussuriysk in the Far Eastern Military District during July. The 56th Separate Guards Air Assault Brigade was formed on 1 October 1979 in Chirchiq from the disbanded 105th Guards Airborne Division's 351st Guards Airborne Regiment.  The new brigade inherited battle honors from that unit.  On 13 December, the brigade was transferred to Termez in preparation for deployment to Afghanistan.  On 27 December, the brigade's 4th Airborne Battalion crossed the Afghan border and secured Salang Pass.  The 3rd Air Assault battalion was airlifted by helicopter into Afghanistan and captured Rabat-Mirza-Kushka Pass on the next day.  Between 13 and 14 January 1980, the brigade crossed the border and concentrated at Kunduz.  At the same time, the 3rd Air Assault Battalion moved to Kandahar.  In February, the 4th Airborne Battalion was transferred to Charikar but was moved back to Kunduz in the same year.  The 2nd Air Assault Battalion was attached to the 70th Separate Motorized Rifle Regiment in March.  In December 1982, the brigade was moved to Gardez.  The brigade was reequipped with the BMP-2 infantry fighting vehicle in 1985.  On 5 April, it was awarded the Order of the Patriotic War 1st class.  It fought in Operation Magistral from December 1987 to January 1988.  In June 1988, the brigade crossed the border back into Turkmenistan during the Soviet withdrawal from Afghanistan.  After its return from Afghanistan, the brigade was based in Ýolöten. The brigade was formed as the 11th Separate Airborne Brigade on 1 August 1968 in Mogocha.  Along with the 13th Separate Airborne Brigade, it was the first of many Soviet air assault brigades formed in the Cold War.  It was formed from the 1st Battalion of the 113th Guards Motorized Rifle Regiment of the 38th Guards Motor Rifle Division, which was renamed the 617th Separate Airborne Assault Battalion.  The 696th Helicopter Regiment, 656th Separate Communications Company and the 49th Separate Airfield Technical Support company combined to form the 211th Aviation Group.  The 618th and 619th Separate Airborne Assault battalions were formed from two battalions of the 52nd Motorized Rifle Division in Nizhneudinsk.  The 284th Independent Artillery Battalion was formed in Mogocha during the same month.  The 617th, 618th and 619th Separate Airborne Assault Battalions (OVSHB) became air assault battalions (ODSHB) in April 1969.  In July 1971, it was renamed the 11th Landing-Assault Brigade (air assault; ODShBr). The 247th Guards Air Assault Regiment is a regiment of the Russian Airborne Troops, currently part of the 7th Guards Mountain Air Assault Division.  It was first formed in 1973 as the 21st Air Assault Brigade and was transferred to the Soviet Airborne Troops in 1990, becoming the 21st Airborne Brigade.  The brigade was renamed the 247th Air Assault Regiment in 1998.  In 1998, it also gained the title 'Caucasian Cossack', although it is not all composed of Cossacks.  In 2013 it became a Guards regiment.  The brigade fought in the First Chechen War, the War of Dagestan, the Second Chechen War, the Russo-Georgian War, and the War in Donbass. The Salang Pass (Persian: كتل سالنگ‎ ‎ , el.  3878 m ) is nowadays the major mountain pass connecting northern Afghanistan with Parwan Province, with onward connections to Kabul Province, southern Afghanistan, and to the Pakistani province of Khyber Pakhtunkhwa.  Located on the border of Parwan Province and Baghlan Province, it is just to the east of the Kushan Pass, and both of them were of great importance in early times as they provided the most direct connections between the Kabul region with northern Afghanistan or Tokharistan.  The Salang River originates nearby and flows south. Alexey Vasilievich Naumets (Russian: Алексей Васильевич Наумец; born 11 February 1968) is a Russian Airborne Troops major general.  He served with the airborne troops from 1986 and fought in the Second Chechen War and Russo-Georgian War.  Naumets was severely injured in a car accident with Russian Airborne Troops commander Vladimir Shamanov in October 2010 while acting commander of the 106th Guards Airborne Division.  In February 2013, he was appointed commander of the 76th Guards Air Assault Division at Pskov.  He was promoted to major general in June 2014.  Naumets was placed on the European Union sanctions list in September 2014 for his command of the 76th Guards Air Assault Division in Crimea. The 80th Airmobile Brigade (Ukrainian: 80-та окрема аеромобільна бригада ; Military Unit Number A0284) is an airmobile formation of the Ukrainian Ground Forces.  The brigade is part of Operation Command West.  The brigade traces its history back to the 80th Airborne Regiment, formed in 1955 as part of the Soviet airborne's 7th Guards Airborne Division.  Four years later, the regiment transferred to the 104th Guards Airborne Division.  It participated in Operation Whirlwind in 1956 and Operation Danube in 1968.  In 1979, the regiment was disbanded and used to form the 39th and 40th Separate Air Assault Brigades of the Soviet Army.  The 39th Separate Air Assault Brigade became the 224th Training Center after transfer back to the Soviet airborne in 1990.  The training center was taken over by Ukraine in 1992 with the dissolution of the Soviet Union and became the 6th Separate Airmobile Brigade in 1995.  In 1999, the brigade was reorganized into the 80th Airmobile Regiment, part of the 13th Army Corps.  In 2013, the regiment was upgraded and became a brigade.  The brigade fought in the War in Donbass. The 38th Guards Air Assault Brigade was formed in October 1979 from the headquarters of the 105th Guards Airborne Division in Brest, part of the Belorussian Military District.  The official day of formation is considered to be 10 November.  The brigade was composed of three airborne battalions, an air assault battalion, an artillery battalion and an antiaircraft artillery battalion.  From 4 to 12 September 1981, the brigade participated in the exercise "West-81".  Between August 1987 and June 1989, the brigade was commanded by Vitaly Raevsky.  Due to the Nagorno-Karabakh War, the brigade was deployed to Baku in January 1990.  On 1 June 1990, the brigade was transferred to the Soviet airborne and renamed the 38th Guards Airborne Brigade.  Its air assault battalion was disbanded and the antiaircraft artillery battalion became a battery.  After the Dissolution of the Soviet Union, the brigade was transferred to the Armed Forces of Belarus.
Answer: 27 December