US Department of Defense - - Responsibilities: Mow grass, lay sod, weed flowerbeds, trim and edge walkways and lawns.; Prune shrubs and trees; apply fertilizer, water plants, clean out drainage ditches, shovel snow from walks and driveways.; Load and unload conveyances; move materials using wheelbarrows, hand trucks or dollies; stack and arrange supplies for storage; collect refuse and recyclable materials.; Dig, fill and tamp soil and gravel in earth excavations; level ground using pick, shovel, tamper and rake.; Adjust, clean, oil and change attachments on machines; use chemicals and cleaning solutions.