Possible Clues:

• I'm leader desperately trying to bring improvements
• Army regiment to ring about special teaching
• Likely to heal in the case of yours truly, laid up
• Engineers face palliative
• Intended to cure soldiers getting laid up
• Soldiers face trying to regain lost ground
• Mere smear on the face making things better
• Concerned with those with learning difficulties, for example
• Providing a cure for disease or deficiency
• Purpose of treatment for soldiers laid up