Please think about this.  US troops in both Japan and South Korea are there under false pretenses.  North Korea is not aggressive - they are no more suicidal than you are. 

Troop numbers for the years 1950 - 2005   sourced from:          http://www.heritage.org/defense/report/global-us-troop-deployment-1950-2005

2012               28,500

2013               28,500

2014               29,300

2017                23,468

The agreed ceiling of US troops in South Korea is 28,500

For up - to date number, see:

http://www.visualcapitalist.com/u-s-military-personnel-deployments-country/

Are U.S. troops in South Korea still necessary?

http://america.aljazeera.com/opinions/2014/1/are-u-s-troops-insouthkoreastillnecessary.html

It's time for the U.S. military to leave South Korea

http://theweek.com/articles/570764/time-military-leave-south-korea

Why Are U.S. Troops Still In Korea?

https://www.forbes.com/sites/dougbandow/2011/05/03/why-u-s-troops-still-in-korea/#138ed5f95c92

Of Bases and Budgets  

   http://www.kpolicy.org/documents/interviews-opeds/111021christineahnhyunleebasesandbudgets.html 

Christine Ahn* and Hyun Lee* | October 21, 2011

[Originally published in Foreign Policy in Focus, October 6, 2011]