This report outlines the defense related appropriations request for fiscal year 2018 and selected issues in Congress dealing with the defense budget.

This report provides background information and potential issues for Congress on the Navy's irregular warfare (IW) and counterterrorism (CT) operations. The Navy's IW and CT activities pose a number of potential oversight issues for Congress, including how much emphasis to place on IW and CT activities in Navy budgets, particularly in a context of constraints on Navy budgets and Navy desires to devote resources to developing "high end" combat capabilities for countering improved conventional military capabilities of countries such as China and Russia.

This report outlines the National Science Foundation's 2017 fiscal year appropriations request and compares it with past years.The Trump Administration is seeking $6.653 billion for NSF in FY2018, an $819 million decrease (-11%) from the FY2017 enacted level of $7.472 billion.

This report provides an overview of Arctic-related issues for Congress, and refers readers to more in-depth CRS reports on specific Arctic-related issues. Some general issues include Arctic territorial disputes; commercial shipping through the Arctic; Arctic oil, gas, and mineral exploration; endangered Arctic species; and increased military operations in the Arctic, which could cause the region in coming years to become an arena of international cooperation or competition. 2018 fiscal year funding requests are included.

This report provides background information and issues for Congress on the John Lewis (TAO205) class oiler shipbuilding program, a program to build a new class of 20 fleet oilers for the Navy. The TAO-205 program was previously known as the TAO(X) program. The first ship in the program was funded in FY2016 at a cost of $674.2 million. The Navy's proposed FY2018 budget requests $466.0 million in procurement funding for the second ship, which the Navy wants to procure in FY2018, and $75.1 million in advance procurement (AP) funding for the third ship, which the Navy wants to procure in FY2019. Decisions that Congress makes regarding the program could affect Navy capabilities and funding requirements and the U.S. shipbuilding industrial base.