A letter report issued by the Government Accountability Office with an abstract that begins "In conventional warfare, support forces such as military police, engineers, and medical personnel normally operate behind the front lines of a battlefield. But in Iraq and Afghanistan--both in U.S. Central Command's (CENTCOM) area of responsibility--there is no clear distinction between front lines and rear areas, and support forces are sometimes exposed to hostile fire without help from combat arms units. The House report to the National Defense Authorization Act for fiscal year 2010 directed GAO to report on combat skills training for support forces. GAO assessed the extent to which (1) Army and Marine Corps support forces are completing required combat skills training; (2) the services and CENTCOM have information to validate completion of required training; and (3) the services have used lessons learned to adjust combat skills training for support forces. To do so, GAO analyzed current training requirements, documentation of training completion, and lessons learned guidance; observed support force training; and interviewed headquarters officials, trainers, and trainees between August 2009 and February 2010."

The first half of this report looks at the background of U.S. travel restrictions to Cuba over the last 40 years. The second half of this report looks at several initiatives from the 111th Congress that would ease U.S. travel restrictions to Cuba.

This report covers the contentious travel restrictions between the U.S. and Cuba from the 1960s to the present time. It includes background on the restrictions, enforcement of restrictions, and arguments for or against maintaining travel restrictions. It also provides background on relevant legislative initiatives during the 106th through the 111th Congresses.

This report discusses domestic and global nuclear security measures. It talks about the challenges to achieve the four-year goal, the multilateral efforts to improve nuclear security, and the role of nongovernmental organization and the nuclear industry. The report concludes that Congress will continue to decide on funding for the U.S. domestic and international programs focused on nuclear material security and nuclear terrorism prevention. Congress is also likely to assess implementation of the Administration's goal to secure nuclear materials by the end of 2013.

This report summarizes the earmarks disclosed for the 12 regular, annual appropriations bills for each of FY2008, FY2009, and FY2010 and analyzes the data without additions or deletions. For individual earmarks, the disclosures typically identify the federal agency, project name, amount, and requester. In some cases, other information also has been included, such as an account within an agency, or the purpose or location of the earmark.

We introduce new concepts for increasing the efficiency of solid state lasers by using gratings deposited on laser slabs or disks. The gratings improve efficiency in two ways: (1) by coupling out of the slab deleterious amplified spontaneous emission (ASE) and (2) by increasing the absorption efficiency of pump light. The gratings also serve as antireflective coatings for the extracting laser beam. To evaluate the potential for such coatings to improve laser performance, we calculated optical properties of a 2500 groove/mm, tantala-silica grating on a 1cm x 4cm x 8cm titanium-doped sapphire slab and performed ray-trace calculations for ASE and pump light. Our calculations show substantial improvements in efficiency due to grating ASE-coupling properties. For example, the gratings reduce pump energy required to produce a 0.6/cm gain coefficient by 9%, 20% and 35% for pump pulse durations of 0.5 {micro}s, 1{micro}s and 3{micro}s, respectively. Gratings also increase 532-nm pump-light absorption efficiency, particularly when the product slab overall absorption is small. For example, when the single-pass absorption is 1 neper, absorption efficiency increases from 66%, without gratings, to 86%, when gratings are used.

Financial regulatory reform is being discussed in the 111th Congress, the continuation of a policy debate that began before the September 2008 financial disruption. This report reviews issues related to financial regulation. It provides brief descriptions of comprehensive reform bills in the 111th Congress that addresses these issues.

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