Simplify the following text for a Grade 10 native English-speaking person.
Original: ' ( Urdu , Punjabi : , RÄ walpindÄ `` ) is a city in the Pothohar region of Pakistan in Punjab province near Pakistan 's capital city of Islamabad , in the province of Punjab .
Simplified: Rawalpindi ( Urdu : Ø Ø Ù Ù Ù 3\/4 Ù Ú Û RÄ walpindÄ `` ) is a city in the Pothohar Plateau near Pakistan 's capital city of Islamabad , in the province of Punjab . It is the military headquarters of the Pakistan Armed Forces and also served as the nation 's capital while Islamabad was being constructed in the 1960s .