The Upgrade and Reinforce Panel can be used to return squads to full strength after taking casualties. To reinforce a squad that has taken casualties, move it close to your HQ or a halftrack. A Reinforce icon will appear above it. Either tap directly on the icon, or open the Upgrade and Reinforce panel and tap the Reinforce button. Each tap will replenish the squad with one member. If you have multiple squads selected, tapping the button will reinforce them simultaneously.