The problem that affected the South Vietnamese army after the outbreak of disease is The troops were spread thin and Desertions reached an all-time high.
An official signing of An Agreement Ending the Conflict and Specializing In helping in Vietnam takes place in Paris between the United States, South Vietnam, the Viet Cong, and North Vietnam.
The war in Vietnam continued after the Paris Agreement was signed. The Saigon regime worked day and night to destroy the last communist units in the south, while northern officials maintained the strength of their armed forces in expectation of a potential future conflict.
Therefore, option 1 and 2, the troops were spread thin and desertions reached an all-time high is a correct answer.
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