Which of the following is NOT one of the phases in a quick smoke mission?

In a quick smoke mission, the phases are structured to ensure effective deployment and coordination of smoke assets. The establishment of smoke fields typically involves distinct phases which include the adjustment phase, where initial rounds are fired to obtain the desired impact area; the establishment phase, which focuses on laying down a continuous screen of smoke; and the maintenance phase, concerned with sustaining the smoke screen over the intended period.

The observation phase, while crucial in other types of missions, does not specifically denote a distinct phase in the quick smoke mission process. This mission emphasizes the rapid deployment and effectiveness of smoke rather than prolonged observation, making it a less critical component in this context. Therefore, the absence of an observation phase as a listed segment in quick smoke missions confirms it as the correct selection for this question.