Oshkosh Truck Corp., Oshkosh, Wis., added the Ariel Appreciation, American Funds Capital World Growth & Income and Fidelity Diversified International funds as investment options in its three 401(k) plans, which have combined assets of $179 million, said Kathy Brown, benefits manager. The plans, which mirror each other, will drop the Strong Opportunity and Janus Worldwide funds, Ms. Brown said. Investment committee members made the changes following a quarterly review, she said, declining to elaborate. The plans will offer 18 funds, up from 17. Fidelity is the bundled provider. Consultant Robert W. Baird assisted.