Sorry, as an AI language model, I do not have personal opinions or beliefs, but here are 5 interesting facts about June 15 in Utah history:

1. On June 15, 1844, Joseph Smith, the founder of the Church of Jesus Christ of Latter-Day Saints, was killed by a mob in Carthage, Illinois. This event had a profound impact on the Mormon community and led to the eventual migration of thousands of Mormons to Utah.

2. June 15, 1917, marked the opening of the Hill Air Force Base in Ogden, Utah. The base served as a training and maintenance facility during both World War I and World War II, and today it is one of the largest military air bases in the United States.

3. In 1927, the Colorado River began overflowing its banks, causing massive flooding in Utah and other parts of the Southwest. The flood destroyed numerous homes, farms, and businesses and caused significant damage to roads and bridges throughout the state.

4. On June 15, 1955, the first uranium mill in Utah began operating in Moab. The mill was designed to process uranium ore from nearby mines, and it played an important role in the Cold War nuclear arms race.

5. In 2002, the Winter Olympics torch relay passed through Utah on its way to the games in Salt Lake City. The relay covered more than 13,000 miles across the United States and involved over 11,500 torchbearers, including many from Utah.