Simplify the following text for a Grade 5 native English-speaking person.
Original: Captain IvÃ n Castro ( born 1967 ) is a U.S. Army officer who has continued serving on active duty in the Special Forces despite losing his eyesight .
Simplified: Captain IvÃ n Castro ( born 1967 ) is a U.S. Army officer who did not leave the Special Forces after becoming blind .