 Complete the following phrase:  The Vietnam-era jungle boots were quite successful. They went through minor improvements since 1962 and used in large numbers by troops in the Republic. Jungle boots were the standard combat footwear for mild weather for decades following Vietnam. The last nomenclature for jungle boots was Boot, Hot Weather, Type I, Black, Hot-Wet, and uses either OG107 green or black for the nylon sections of the upper. In addition, the Mod 2 boot is identical except with tan color for the leather and the nylon, eliminating the protective steel plate because of its reliability as a conductor of heat in hot sand and vent eyelets because they allow sand in. The US military jungle boot helped influence the design of the notorious Desert Combat Footwear of the Americans next series of wars, Operation Desert Storm in 1991, Operation Enduring Freedom in Afghanistan in 2001, and 