'Straško the Terrible' was an Improvised AFV made from a tractor chassis, used by Croatia. This photo was taken by Rafał Białęcki in September 2008, where the vehicle was kept at the 'Museum of Croatian War of Independence' in the village of Turnu, Croatia.
This particular vehicle was constructed over the base chassis of a civilian tractor and was up-armoured and nicknamed ''Straško' or the 'Terrible' by Croatian fighters. It's main armament was a Yugoslavian M53, based on the WW2 vintage MG42, still in it's original calibre of 7.92 Mauser. 'Straško' has been kept in working condition by the museum and is apparently used for displays, events and anniversaries, including a trip to the capital city of Zagreb in 2001. From what I could find this example was built by the 17th Home Regiment around the region of Sunja at some point between Summer 1991 and August 1995, where it was involved in attacks by the 17th alongside infantry of the 151st Brigade and others that were of mixed success during August of 1995 as part of 'Operation Storm'. At least one other similar pattern tractor was also constructed by the Croatian 128th Brigade circa 1992.
'Straško the Terrible'
The technical has three access points- one sloped armour door to the rear and two doors on the back of the sides of the vehicle, one of which is visible here. The open hole on the side was for storage boxes that are missing from this example but present on others. The armour used on these technicals seemed to have performed well, something noted on Scorpion 2, and other examples of Croatian technicals during the conflict were able to shrug off rifle 7.62x39 and 7.62x54R calibre fire and artillery shrapnel. 'Straško' had a 70 Horsepower engine from the original tractor, and the vehicle line were designated as HIAV (Croatian Engineering Anti-Terrorist Vehicle) because the long sloping 12-15MM thick armour plates on the frontal armour and dozer blades were to be used to destroy barricades in urban combat before it would engage with it's weapons. The crew was two men, driver and gunner, with 6 passengers. Only the first prototype, built between September 7th and September 25th, 1991, was armed with a 20MM cannon, with the rest planned to mount machineguns like the example here. Overall weight of the vehicle was 9.2 tons. (1)
The design was semi-standardised, and 16 vehicles were built to the same kind of chassis over tractor hulls, but armament varied between what appears to have been MG-42's, M1919 or similar air cooled MG's, a Soviet HMG of some kind with one notable example mounting a single 20MM Zastava automatic cannon in a fully rotating turret, with no standardisation of camo or accessories. The original prototype 20MM Strasko was used by the 111th Brigade on the Lika Front near Glibodol in late 1991.
1- Vokislav Jereb, English by David Spencer, Croatian Improvised AFV's 1991-1995- A Pictoral History, Adamic, (2002)