>>173
>SDD＝試作機の事

https://www.state.gov/wp-content/uploads/2019/04/02-205-United-Kingdom-Defense-JSF-2.5.2002.pdf
Replace the abbreviation "EMD" with the abbreviation "SDD" wherever it appears in the JSF EMD Framework MOU

SDDはEMDの単なる置き換えだよ
独自定義はやめてね