If you have played like me and by the moment have 3 Mad Cat's (A, W, J) + 1 Masakari W then you can try such strategy - put in all mech's regular pilots. So by the end you can increase chances for them to become veterans. In additional you can take 1 Jagermech, for example. There no any clans mechs here and with such combination regular one will not able to stop you at all (1 Atlas not count; and Awesome's too).
In additional - you can take control of the base on northeast if you have jumping mech in this mission. There is also repair bay here. After it, if you have problems to deal with which one left - just bring them to the base - turrets will finish them.