I need $62K for a 6-mo reserve, which includes business expenses. Of that $42K is in a taxable brokerage invested in short duration US government bond ETFs, while the rest is spread throughout a handful of checking accounts as a buffer.
For short term savings goals, I put those in short term corporate bond funds (slightly higher yield/risk than treasuries) with maturity that corresponds to my expected expenditure. That way, the closer it gets to the expense, the lower the volatility.
Once I'm done funding my real estate investments in five years, I will actually start investing my growing taxable funds, incl. EF, in a blend of equities and bonds. Let's say you need an EF of $25K and have a taxable portfolio of $250K -- I see no need to hold that $25K in cash or equivalents and lose out on long term gains.
Aside from your EF, you should save separately for short term non-emergency expenditures. I think either low duration bonds, CDs, or HY savings is fine for that, but it should be treated separately from your EF.
With regards to a VA loan, there is a new funding fee structure as of Jan 1, so check that out. I'm a subsequent borrower (i.e. already used some entitlement) so plan to put down 5% to get a substantially lower funding fee on my next purchase.