Please give three reasons with justifications in favor of a pacifist United States. Is being a pacifist the same as being neutral in war?

A pacifist United States would save a lot of money on its military.  If a nation renounces the use of force, as Japan did in its Constitution following World War II, then it has little reason to spend on its military-industrial complex.  A great deal of the United States' budget goes toward defense.  Without this, the money could be spent on internal improvements or social welfare programs.  
A pacifist United States would possibly have a better reputation abroad.  The United States is in favor of human rights, but many civilians die in attacks aimed at killing terrorists.  The drone program has been especially controversial as of late in the United States, as these devices kill as many civilians as surgical bombing campaigns.  If the United States adopted a policy of peace, it might develop a better reputation in the Middle East.  
A pacifist United States might save American lives.  Thousands of men and women in uniform risk their lives for the United States daily.  By cutting down on these numbers, these men and women can take their talents into the civilian world.  While it is uncertain what other nations would do if the United States took on a pacifist foreign policy, it is certain that another nation would have to take the lead in sending in troops.  
A pacifist nation is not necessarily "neutral" in times of war.  A pacifist nation refuses to take part in wars, whereas a neutral nation only refuses to take sides.  The United States has professed neutrality many times but has still traded with the belligerents.  This happened in both the War of 1812 and World War I with the same result—the United States was drawn into the war after attacks on American shipping.  A pacifist nation would not have traded with the belligerents at all since it does not believe in war.