American Equity Investment Life Holding Co. on Wednesday unveiled a giant American flag mural mounted on the exterior of its West Des Moines headquarters. The mural, which measures nearly 600 square feet on the south side of the building, was installed to kick off a yearlong celebration of American Equity’s 20th anniversary. The company is also in the process of installing a company timeline in the main lobby of the headquarters at 6000 Westown Parkway. The flag installation will remain up for a year. “We wanted to create something unique and memorable as a reminder as to how far we’ve come in a relatively short time,” said Ron Grensteiner, president of American Equity.