Herndon-based MicroPact Inc. is merging with Arlington-based Iron Data Inc., the companies announced Tuesday. Financial terms of the merger of two technology contractors weren't disclosed. Current Iron Data CEO Tom Sechler now serves as chief executive of the merged company. MicroPact founder and CEO Kris Colli serves as president. The merged company operates under the MicroPact name. Both federal contractors make business management software. MicroPact, which recently signed a deal worth up...