What the total launch failures one when it is 4 launches, and not usable more greater 0?
Block Launched Operational Not usable Retired Launch Failures
List of GPS satellites
16103661
text real real real real real
2-16103661-2
Satellites by block
Satellites by block
Block I 11 0 0 10 1
Block II 9 0 0 9 0
Block IIA 19 8 1 10 0
Block IIR 13 12 0 0 1
Block IIRM 8 7 0 1 0
Block IIF 4 4 0 0 0
Total 64 31 1 30 2
SELECT SUM Launch Failures FROM table WHERE Launched = 4 AND Not usable > 0
4 0