Numerous concise recommendations appear in the notebook volume bearing the number 401.0-B. Each recommendation is dated, and the most recent revision is shown in the table of contents. These Recommendations are developed for conventional near-Earth and deep-space missions having moderate communications requirements. The current update adds a new recommendation 2.4.21A and updates recommendations 2.4.12A, 2.4.12B, and 2.4.20B.