Try this one

=SUMPRODUCT(ISNUMBER(SEARCH("W7ZPB1",Master!$B$1:$ B$300))*ISNUMBER(SEARCH("OD",Master!$K$1:$K$300))* ISNUMBER(SEARCH("9",Master!$U$1:$U$300))*ISNUMBER( SEARCH({"MG","BG","COL","LTC","MAJ","CPT","1LT","2 LT","CW4","CW3","CW2","WO1"},Master!$E$1:$E$300) ))

I've used this from cell F19