This is from one of HRC's websites, for those interested. Bottom line, you can now wear both the KDSM and OSR as long as you meet all the requirements.
Korea Defense Service Medal (KDSM)
o AR 600-8-22, Military Awards, Paragraph 2-20.
o AR 670-1, Wear and Appearance of Army Uniforms and Insignia, Paragraph 29-6d (precedence of wear).
Background/Policy: The Korea Defense Service Medal (KDSM) was authorized by Section 543, National Defense Authorization Act, 2003. It is authorized for award to members of the Armed Forces of the United States who have served on active duty
in support of the defense of the Republic of Korea. The area of eligibility and period of eligibility are as follows: The area of eligibility encompasses all land area of the Republic of Korea, and the contiguous water out to 12 nautical miles, and all air spaces above the land and water areas. The period of eligibility is 28 July 1954 to a date to be determined by the Secretary of Defense.
Service members must have been assigned, attached, or mobilized to units operating in the area of eligibility for 30 consecutive or for 60 nonconsecutive days, or meet the following criteria:
(1) Be engaged in combat during an armed engagement, regardless of the time in the area of eligibility.
(2) Is wounded or injured in the line of duty and requires medical evacuation from the area of eligibility.
(3) While participating as a regularly assigned air crewmember flying sorties into, out of, or within the area of eligibility in direct support of military operations. Each day that one or more sorties are flown in accordance with these criteria will count as one day toward the 30 or 60-day requirement.
(4) Personnel who serve in operations and exercises conducted in the area of eligibility are considered eligible for the award as long as the basic time criteria is met. Due to the extensive time period for KDSM eligibility, the nonconsecutive service period for eligibility remains cumulative throughout the entire period.
Service members qualified for the Armed Forces Expeditionary Medal by reasons of service between 1 October 1966 and 30 June 1974, in an area for which the KDSM was authorized subsequent are eligible for both the Armed Forces Expeditionary Medal and the KDSM. Award of the KDSM for this time period is a one-time exception to policy to comply with section 543 of the National Defense Authorization Act of Fiscal Year 2003, Public Law 107–314.
The KDSM may be awarded posthumously to any Soldier who lost his or her life without regard to length of such service.
Only one award of the KDSM is authorized for any individual.
Questions and Answers
Question 1: Are ROTC Cadets eligible for the KDSM?
Answer 1: Yes, ROTC Cadets who go TDY to Korea on one of the various ROTC programs are entitled to the KDSM provided they meet the basic criteria.
Question 2: Do I have to take off my OSR if I am now eligible for the KDSM?
Answer 2: Negative, Soldiers are authorized to receive the OSR for completion of their tours in the area and authorized to receive the KDSM for serving in Korea.
Question 3: I was stationed in Japan and went to Korea to complete PLDC. Do I qualify for award of the KDSM?
Answer 3: Negative. The DoD guidance only authorizes the KDSM to be awarded to service members who are assigned, attached, or mobilized to the area. Soldiers can also qualify if they were in Korea for an exercise or operation.
Question 4: Can I get multiple awards of the KDSM?
Answer 4: No, only one award of the KDSM is authorized for any individual. Multiple awards are not authorized. No appurtenances will be placed on the KDSM to denote multiple awards.
Question 5: How do I get my records updated with the KDSM?
Answer 5: Military personnel divisions/Brigade S1s (whomever is the records custodian) will update personnel qualification records of qualified Soldiers who meet the medal criteria.
Question 6: Do I get a certificate and orders for the KDSM?
Answer 6: Negative. The KDSM is categorized as a service award, as such permanent orders are not required. Certificates also do not accompany award of the KDSM.
Question 7: Do veterans use a Standard Form 180 to request the KDSM?
Answer 7: Please refer all veteran requests who have left service prior to 2002 to the National Personnel Records Center (NPRC), the National Archives (NARA) at www.archives.gov.
Question 8: My Brigade Commander has been to Korea several times during his career for various exercises. His time of service in Korea has been more that 60 days nonconsecutive. Without documentation for all of these exercises he has been on how can I get the KDSM awarded to him?
Answer 8: Documentation proving your Commander actually served is imperative in authorizing the KDSM. Examples would be TDY orders, LES, any form of documentation showing he was in Korea for the required amount of time.