Which manual covers Mortars specifically?

The correct response is focused on TC 3-22.90, which specifically addresses the training and employment of mortars. This manual provides comprehensive guidelines about mortar systems and their integration within infantry operations, including tactics, techniques, and procedures necessary for effective mortar employment. It emphasizes the roles of mortars in support of ground troops and outlines how they should be used in various combat scenarios.

In contrast, other manuals, while they may include references to mortars, do not focus exclusively on mortar systems. For example, FM 3-21.90 primarily deals with infantry operations and tactics more broadly, and ATP 3-21.80 provides general guidance for various weapon systems but does not drill down into specific mortar techniques like TC 3-22.90 does. FM 3-22.10 tends to focus on weapons training in a broader sense, emphasizing proficiency in firearms rather than specifically honing in on mortar usage. Thus, TC 3-22.90 stands out as the dedicated source for those seeking in-depth understanding of mortar systems within an infantry context.