For nearly five years, #Guardians have been committed to securing our Nation's interests in, from, and to space. . Guardians like Spc. 4 Roberto Santiago-Irizarry & 2nd Lt. Yoon Jung Lee, both with the 18th Space Defense Squadron, are critical to our space mission & provide conjunction analysis & potential collision notifications to NASA & other satellite owner-operators. . . . . . vandenberg_sfb | #guardians #USSF5 #SpaceForce #SempraSupra