Guam 's almost unrestricted airspace and the close proximity of the Farallon de Medinilla Island makes this an ideal training environment .
The Farallon de Medinilla Island is a naval bombing range approximately 150 miles ( 240 km ) north .
Guam 's almost unrestricted airspace and the close proximity of the Farallon de Medinilla Island , a naval bombing range approximately 150 miles ( 240 km ) north , makes this an ideal training environment .