Juutilainen entered the
Finnish military on 9 September 1932 for his compulsory military service, serving as a pilot in the
Finnish Air Force starting in 1935. On 1 May 1935, Juutilainen was promoted to sergeant. He was transferred to
LeLv 24, operating from
Utti, on March 3, 1939. In October 1939, with the situation worsening, the squadron moved to Immola, closer to the Finnish-Soviet frontier. During the
Winter War (which broke on 30 November 1939) Juutilainen flew the
Fokker D.XXI. He scored his first victory on 19 December 1939, shooting down an
Ilyushin DB-3 bomber and damaging two more. At the end of the Winter War, Juutilainen had achieved one shared and two individual victories. During the
Continuation War, Juutilainen served in
3/LeLv 24, flying a
Brewster B-239 "Buffalo". On 21 July 1941, Juutilainen and five other Buffaloes scrambled to intercept Soviet fighters from 65th ShAP that were strafing Finnish troops near
Käkisalmi. During that sortie, he destroyed a
Polikarpov I-153 'Chaika', making him an "ace" in the Brewster Buffalo. A few days later, on 1 August, seven fighters under the command of First Lieutenant Karhunen destroyed six I-16s near
Rautjärvi, and Juutilainen (having been promoted to
Warrant Officer in the meantime) claimed two of them. On the morning of 6 February 1942, while reconnoitering the Petrovkiy-Jam region with other LLv 24 pilots, Juutilainen intercepted seven
Tupolev SB bombers escorted by 12 MiG-3s. Juutilainen claimed two SBs. Juutilainen later recalled: On 27–28 March 1942,
3/LLv 24 moved to Immola in preparation for a Finnish Army offensive on Suursaari, in the Gulf of Finland. Although grossly outnumbered over the Gulf of Finland,
LeLv 24 pilots were more experienced than their Soviet opponents from Red Banner Baltic Fleet. Even when they had the advantage of surprise and height, Soviet pilots did not succeed in shooting down Finnish pilots. at the Tiiksjärvi Airfield during the winter of 1942–1943. On 28 March, WO Juutilainen, in patrol with Sgt Huotari, attacked some "Chaikas" of 11 IAP over the Suurkylä shoreline, at
Hogland, and shot down two of them. These air victories took Juutilainen's tally to 22. A month later, on 26 April, he became his unit's first recipient of the Mannerheim Cross. On 20 September, he took off with Capt Jorma Karhunen and
3/LeLv 24 pilots for a patrol of the
Kronstadt--
Seiskari region. Near the Estonian coast, they were bounced by ten Soviet fighters. But the Finnish quickly reacted and managed to down three of their opponents. WO Juutilainen was credited with two kills. With the Bf 109, he shot down a further 58 enemy planes. He shot down six Soviet airplanes on 30 June 1944 (all confirmed on Soviet loss records), becoming an
ace in a day and parallelling
Jorma Sarvanto's score on 6 January 1940 in the
Winter War. Juutilainen refused an officer commission, fearing it would keep him from flying. His 94th and last victory was a
Li-2, the Russian version of the
Douglas C-47, shot down on 3 September 1944 over the Karelian Isthmus. ==Post-war==