First half revenue increased 3%, with growth across all three segments. GAAP EPS was up 3% due to the absence of Exelis acquisition-related charges incurred in the first half of fiscal 2017, partially offset by the non-cash charges incurred in the second quarter of fiscal 2018. Non-GAAP EPS was up 15% on increased volume, benefit from tax reform, higher pension income, strong program execution and year-over-year integration synergy savings, partially offset by a $36 million unfavorable impact from the ADS-B program. Non-GAAP operating margin was strong at 18.9%. Orders grew 24%, resulting in a book-to-bill of 1.3.
|($ millions)||Second Quarter||First Half|
|FY 2018||FY 2017||Change||FY 2018||FY 2017||Change|