As of this posting, btw, you find the Alpha Strike Role under the Basic Filters button when you use the Units option. You could also filter for Size by using tonnage ranges (0-59, 60-69, 70-79, 80-100.)
The Alpha Strike button is for unit SA, like IF, ENE, etc.
All told, if you learn a few tricks, you can use the MUL to quickly narrow down your list of suspects for Force Building. Especially if you right click on your link to open the candidates in a new tab.