After years of aerial and naval bombardment by US aircraft and battleships, the cities ofand Hạ Long had become feared for their well-organised Surface-to-Air Missile (SAM) and flak defences aided by intelligent radar capabilities.
At the beginning of 1975, Nguyễn Ðức Thọ had the opportunity to study the northern defences in detail while painting regularly in January that year. In one of his paintings, Thọ depicts Unit D84 missile controllers training in a control unit truck for Soviet-built S-75 SAMs (Russian: С-75; NATO reporting name SA-2 Guideline) (fig. 1). These were part of a highly successful high-altitude air defence system with command guidance. These missiles were used extensively by North Vietnam for the protection of and .
After ending their bombing of North Vietnam, the US Air Force constantly used a high-altitude supersonic spy plane, the Lockheed SR-71 “Blackbird”, to scout and take photos of northern cities and military camps. Unit D84 organised active training missions to best explore various methods of fighting this modern reconnaissance aircraft.
Another of Thọ’s paintings shows the readiness of northern defensive capabilities, depicting an anti-aircraft position of combat Unit No. 84 for the defence ofcity and port (fig. 2). When the radar station identified an enemy aircraft, all anti-aircraft units sounded an alarm to prepare for combat. With the siren raised, soldiers rushed to their fighting positions.
The radars themselves were often positioned in sparse areas, like the radar division of an S-75 SAM system in
Created on at the end of January, Thọ depicts the anti-aircraft artillery position of Battalion No. 81, again charged with the task of defendingcity and port (fig. 4). In this instance, Thọ paints a particular soldier, Hứa Văn Luận, who spent his spare time collecting bricks, gravel and stones. These, Luận and other soldiers arranged on the ground at the base of where missiles were installed so that they remained solid, clean and dry, protected from damp and possible malfunction. This activity was considered a good example for other units to learn from and follow.
Despite being the last stages of the war
In addition, on 28 January, President Ford asked Congress for an additional $522 million in military aid to assist South Vietnam and Cambodia. Ford said that North Vietnam now had 289,000 troops in South Vietnam and large numbers of tanks, artillery, and anti-aircraft weapons. If the request had been approved, it would have certainly meant an increase in the bombing of northern cities.