Question: What war did the owner of the Indianapolis 500 Speedway who jeopardized the 1946 AAA Championship Car season fight in? 

Context paragraphs:
Herman Schurch: Herman Schurch (April 7, 1903 in Sumiswald, Switzerland – November 10, 1931 Los Angeles) was a Swiss-American racecar driver.  His family had emigrated to the United States when he was a boy.  He made five starts in AAA Championship Car from 1929 to 1931.  He had previously failed to qualify for the 1928 Indianapolis 500 but made the race in 1929.  He served as a relief driver for Shorty Cantlon in the 1930 race.  He also drove in the 1931 Indianapolis 500 but his transmission failed after 5 laps.  His best finish in AAA Championship racing came later that year at the New York State Fairgrounds Raceway where he finished sixth.  Schurch excelled in Big Car racing (Sprint Car), where he won many races on the Eastern circuit (in the Northeast United States).  He was killed in practice for a dirt track race at Legion Ascot Speedway in California.  Schurch was elected to the National Sprint Car Hall of Fame in 2010.

1946 AAA Championship Car season: The 1946 AAA Championship Car season was the first season of American Championship car racing following World War II.  After four years without racing in the United States, the AAA Contest Board was initially concerned about having enough races and entrants for the 1946 season.  Even the Indianapolis 500 was in doubt, as the speedway was neglected during the war, and owner Eddie Rickenbacker sold the track to Tony Hulman only in November 1945.  However, as the season progressed, it proved to be a success, and marked a successful return of the National Championship.  George Robson and George Barringer were killed at Atlanta in the race.  Al Putnam died at the Indiana State Fairgrounds Speedway in qualifying.

1938 AAA Championship Car season: The 1938 AAA Championship Car season consisted of two races, beginning in Speedway, Indiana on May 30 and concluding in Syracuse, New York on September 10.  There were also two non-championship events.  The AAA National Champion and Indianapolis 500 winner was Floyd Roberts.

1955 AAA Championship Car season: The 1955 AAA Championship Car season consisted of 11 races, beginning in Speedway, Indiana on May 30 and concluding in Phoenix, Arizona on November 6.  There was also one non-championship event in Mechanicsburg, Pennsylvania.  The AAA National Champion and Indianapolis 500 winner was Bob Sweikert.  Manny Ayulo was killed at Indianapolis while practicing for the 1955 Indianapolis 500, and Bill Vukovich, the two-time defending winner, was killed in the race itself.  Jack McGrath, the two-time champion (1952, 1953), was killed in the final race at Phoenix on lap 85.  This was the last year of the AAA National Championship; USAC sanctioned the series starting the next year.

1947 AAA Championship Car season: The 1947 AAA Championship Car season consisted of 11 races, beginning in Speedway, Indiana on May 30 and concluding in Arlington, Texas on November 2.  The AAA National Champion was Ted Horn, and the Indianapolis 500 winner was Mauri Rose.  Shorty Cantlon died at Indianapolis in the 500 miles race.

1953 AAA Championship Car season: The 1953 AAA Championship Car season consisted of 12 races, beginning in Speedway, Indiana on May 30 and concluding in Phoenix, Arizona on November 11.  There was also one non-championship event in Mechanicsburg, Pennsylvania.  The AAA National Champion was Sam Hanks, and the Indianapolis 500 winner was Bill Vukovich.  Chet Miller died while practicing for the Indianapolis 500.

1941 AAA Championship Car season: The 1941 AAA Championship Car season consisted of three races, beginning in Speedway, Indiana on May 30 and concluding in Syracuse, New York on September 1.  There was also one non-championship event in Langhorne, Pennsylvania.  The AAA National Champion was Rex Mays and the Indianapolis 500 winners were Floyd Davis and Mauri Rose.  The National Championship was not held again until 1946, due to World War II.

Eddie Rickenbacker: Edward Vernon Rickenbacker (October 8, 1890 – July 23, 1973) was an American fighter ace in World War I and Medal of Honor recipient.  With 26 aerial victories, he was America's most successful fighter ace in the war.  He was also considered to have won the most awards for valor by an American during the war according to the April 2017 VFW magazine in their special World War I edition.

1929 Indianapolis 500: The 17th International 500-Mile Sweepstakes was held at the Indianapolis Motor Speedway on Thursday, May 30, 1929.  Ray Keech, who finished fourth a year earlier, took the lead for the final time on lap 158 and won his first Indianapolis 500.  Keech won for car owner Maude A. Yagle, the first and to-date, only female winning owner in Indy history.  Only two weeks after winning the race, Ray Keech was fatally injured in a crash at Altoona Speedway on June 15, 1929.  The race was part of the 1929 AAA Championship Car season.

1940 AAA Championship Car season: The 1940 AAA Championship Car season consisted of three races, beginning in Speedway, Indiana on May 30 and concluding in Syracuse, New York on September 2.  There was also one non-championship event in Langhorne, Pennsylvania.  The AAA National Champion was Rex Mays and the Indianapolis 500 winner was Wilbur Shaw.

Supporting paragraphs: 1946 AAA Championship Car season Eddie Rickenbacker
Answer: World War I