Short-range plans covering a period of one year or less that are designed to implement the activities and objectives specified in an organization's strategic plan are referred to as

Tactical preparation

Explanation:

Tactical preparation takes place after a corporation, group, or entity has developed a strategic plan detailing general objectives and priorities. A tactical plan outlines the measures and activities needed to reach the strategic plan's goals.

For instance, if strategic plan of a company is to be a market leader, its tactical plan could be to increase the total amount spent on marketing.