Red Dawn said:f16s and f18s cannot completely replace e a10s in e CAS role! they are not made to take small arms fire or AA guns in a low & slow flying close air support mission...
The A10 is more vulnerable to enemy fighters & SAMs. At least f16s & f18s can defend themselves and hit burner to get out of dodge. Slow flying is not a requirement for CAS, a number of other attack aircraft use jet engines. (eg. A4 (also retired) & Su-25, although both cannot hit mach 1 but are still faster than the A10.)
A10s should only be used when
1) total air superiority is achieved (eg. f16s/f15s escorts overhead)
2) SAMS & triple-A are suppressed (eg. f16s/f18s taking out radar stations)
for total effect. Notice how f16s can do so many things! (Yes, I'm a '16 fan

The problem with going slow is that it can be seen-> it can be hit -> it can be killed. The US military has evolved to developing SMART & stand-off weapons delivered by stealth/multirole aircraft. Why send 3 flights (1 flight f15 escort, 1 flight f18 SAM suppression, 1 flight a10 CAS) when 1-2 flight f16 can complete the job in 1/2 the time?
I love the A10 for the power it possesses, but to continue to fund it for 1 specific role which other aircraft can do as well is not cost effective.
