S/S Files: NSC 118

Memorandum by the Executive Secretary of the National Security Council (Lay) to the National Security Council

top secret
NSC 118

United States Courses of Action in Korea

References: A. NSC Action No. 5621
B. Memo for NSC from Acting Executive Secretary, same subject, dated September 5, 19512
C. Progress Report, dated September 25, 1951 by the Secretaries of State and Defense on NSC 48/53

At the request of the Acting Secretary of Defense, the enclosed memorandum by the Joint Chiefs of Staff on the subject is circulated herewith for the information of the National Security Council with [Page 1107] reference to NSC Action No. 562–a, and is referred to the Senior NSC Staff for consideration in connection with NSC Action No. 562–b.

In transmitting the enclosure, the Acting Secretary of Defense stated that he concurred with it and invited particular attention to paragraph 9 therein.

James S. Lay, Jr.
[Enclosure]

Memorandum by the Joint Chiefs of Staff to the Secretary of Defense

top secret

Subject: United States Courses of Action in Korea.

1. With reference to your memorandum of 2 October 1951 and the enclosure thereto,4 the Joint Chiefs of Staff have reconsidered the recommendations set forth in their memorandum to you, dated 13 July 1951, on the above subject. As a result thereof, they have formulated the following views regarding the military actions proposed in their previous memorandum.

2. In the event that the current armistice negotiations in Korea fail, the Joint Chiefs of Staff still consider that it would be necessary to increase military pressure on the enemy. They recognize, however, that the scale of these operations must be accommodated to the means available to the Commander in Chief, United Nations Command (CINCUNC) and be in consonance with the situation then prevailing. Further, inasmuch as CINCUNC is in the best position to evaluate the chances of success, he must be accorded a wide latitude of discretion as to the timing, nature, and extent of these operations.

3. The build-up of Communist fighter strength in Manchuria would, in all probability, render pursuit by United States fighter aircraft across the Korean-Manchurian border a costly operation at this time without compensatory advantages. The Joint Chiefs of Staff, therefore, recommend that the subject of pursuit by United States aircraft across the Korean-Manchurian border (loosely termed “hot pursuit”) receive no further consideration as an immediate course of action in the event that the current armistice negotiations fail.

4. The Joint Chiefs of Staff consider, however, that the growing Communist air build-up in North China and Manchuria has reached a stage where serious consequences to United Nations forces in the Korean area might result from the employment of this enemy air potential. Inasmuch as it is the responsibility of the United States to maintain the security of its forces, it must be recognized that it may be necessary for the United States to employ its air forces unilaterally [Page 1108] and on short notice to attack certain Chinese Communist air bases whenever the scale of enemy air activity is such as seriously to jeopardize the security of the United States forces in the Korean area.

5. The Joint Chiefs of Staff now reaffirm the recommendations contained in their memorandum to you dated 13 July 1951, subject to the following changes:

a.
Change subparagraph 1 b to read:
“Direct CINCUNC to increase the scale of his military operations in the Korean area consistent with the capabilities of the forces available to him whenever, in his judgment, such operations will contribute materially toward the destruction of enemy forces and will not result in disproportionate losses to the United Nations forces under his command.”
b.
Delete from subparagraph 1 c the phrase “at least to the neck of the North Korean peninsula”;
c.
Delete from subparagraph 1 d the word “Rashin” and the comma which follows (this change is necessitated by the governmental decision to bomb Rashin); and
d.
Change subparagraph 1 e to read:
“Employ United States air forces (unilaterally and on short notice, if the situation so requires) to attack certain Chinese Communist air bases whenever the scale of enemy air activity is such as seriously to jeopardize the security of the United States forces in the Korean area.”

6. Failure of the current armistice negotiations would indicate the desire of the enemy to prolong the hostilities in Korea, possibly for an indefinite period at approximately the same scale as heretofore. The Joint Chiefs of Staff consider that the measures which they now recommend in that premise would, in all probability, be sufficient to maintain military pressure on the Communist forces in Korea but would not be adequate to achieve a conclusive military decision in the Korean struggle.

7. The Joint Chiefs of Staff have considered other military courses of action for the attainment of a military decision which would allow achievement of a political settlement of the Korean problem satisfactory to the United States. They have concluded that any such military courses of action would require the employment of significant additional United States forces and means.

8. From the United States military point of view, the immobilization of United States ground, air, and naval forces in inconclusive operations in Korea over an indefinite period of time with the attendant attrition of manpower and matériel may become unacceptable. Moreover, it must be expected that, in the event armistice negotiations fail, United States public opinion may demand the adoption of military measures adequate to achieve a satisfactory military conclusion [Page 1109] of the Korean struggle. The Joint Chiefs of Staff are aware of the implications involved in the intensification of military action in Korea on a greatly increased scale. In any event, decision on this matter would have to be preceded by a review of the United States position with respect to its objectives in Korea as well as to United States global strategy. Thereafter, determination would have to be made, among other things, as to:

a.
The extent to which United States military resources should be committed to Korea to achieve United States objectives there; and
b.
Whether the concept of Chinese “volunteers” will continue to be accepted and, if not, whether restrictions regarding the expansion of the area of hostilities into Manchuria and China will continue in effect.

In connection with subparagraph b above it is axiomatic that it would be necessary for this matter at least to be considered by those members of the United Nations actively participating in the Korean conflict.

9. In view of all the foregoing, the Joint Chiefs of Staff recommend that the National Security Council now undertake a review of the United States position with respect to the Korean question to determine what objectives the United States should have for that area in the event current armistice negotiations in Korea fail. United States courses of action in the political and military field for the accomplishment of such objectives can thereafter be determined.

For the Joint Chiefs of Staff:
Omar N. Bradley
Chairman, Joint Chiefs of Staff
  1. See footnotes 4 and 5, p. 964.
  2. See footnote 1 to Marshall’s memorandum of September 4, p. 882.
  3. See the editorial note, p. 936.
  4. Neither printed.