On 14 February, the army leaders from the United States and the United Kingdom signed a Future Vertical Lift Cooperative Program Feasibility Assessment project agreement on behalf of their re-spective countries' services, promising to collaborate to ensure interoperability between the two countries' future rotorcraft aviation forces. The two nations will share information regarding their rotorcraft requirements and future projects. Moreover, they will look into and evaluate new ideas for using coalition airpower in the lower-tier air domain, which is where Army aviation usually oper-ates.