| 100% | AMERICASCALLUP | 14 | Selective Service System, once? |
| 73% | SSS | 3 | Selective Service System, initials |
| 69% | SSS | 3 | Abbreviation for selective service system |
| 49% | MALE | 4 | Selective service registrant |
| 49% | ONEA | 4 | Selective Service designation |
| 48% | TEEN | 4 | Selective Service registrant, agewise |
| 48% | DRAFTBOARD | 10 | Selective Service classification panel |
| 47% | ONEA | 4 | Selective Service classification: 2 wds. |
| 45% | ONEC | 4 | Selective Service category for those currently serving |
| 42% | CONVEYOR | 8 | __ belt; rotating service system in sushi bars |
| 42% | WAF | 3 | Auxiliary service member, once |
| 41% | CBRADIO | 7 | Once-popular two-way chatting service |
| 39% | RFD | 3 | Postal service, once: Abbr. |
| 39% | AWD | 3 | System that uses four tires at once (abbr.) |
| 39% | UBEREATS | 8 | Service that once proposed making deliveries via drone |
| 38% | UNIX | 4 | Common operating system for supercomputers, once |
| 38% | BART | 4 | Train system that services Oakland (Abbr.) |
| 37% | AOL | 3 | Co. once known as Quantum Computer Services |
| 37% | AOL | 3 | Verizon's service, once: Abbr. |
| 36% | LOCKING | 7 | Central __; system for securing all doors at once |
| 36% | AOL | 3 | I.S.P. once called Quantum Computer Services |
| 35% | ESSO | 4 | Its slogan was once "The sign of extra service" |
| 35% | AOL | 3 | It once had a chat service called Instant Messenger |
| 33% | ING | 3 | Financial services company that once sponsored the New York City Marathon |
| 33% | ESSO | 4 | "The sign of extra service" sloganeer, once |
| 32% | UZI | 3 | "Gun in a briefcase" the US Secret Service VIP section once used |
| 31% | UZI | 3 | "Gun in a briefcase" once used by the US Secret Service VIP section |
| 30% | YWCA | 4 | Org. that once used the slogan "In Service for the Girls of the World" |
| 28% | TWICE | 5 | Once more than once |
| 28% | ALLAT | 5 | ___ once |