Boeing’s [BA] top defense executive believes Congress will ultimately allow the Navy to buy about 12 EA-18G Growler electronic attack aircraft in fiscal 2015, a number consistent with what the House of Representatives has already approved but roughly half of what the service would like. The Senate has yet to address the Growlers in a defense appropriations bill for 2015. “We think that at the end of the day we’ll probably end up in the 12-range,” Chris Chadwick, president and…