It’s been two decades since the Presbyterian Church USA moved to Louisville. The city has served as the church’s base of operations ever since. Officials will celebrate the anniversary Wednesday with a special worship service and other events.The church decided to relocate after the north and south branches of Presbyterianism merged in 1983. Executive Director Linda Valentine says theological differences have been ironed out over the years, but recently the church has been hampered by budget constraints.“We’re constantly adjusting the organization to fit both resources and more importantly to fit how we serve the church," she says. "And so through those adjustments, from time to time, there are personnel affected by that.”Two years ago, 75 employees were laid off. Valentine says additional workers could be let go this year. The church currently employs 450 people with a payroll of approximately $20 million.